Graphical method of finding solutions.

Correct answer: D. (y)-axis

In the point ( (0,8) ), (x=0), so it lies on the (y)-axis. Identifying points on axes helps in graph reading.

Correct answer: A. (x)-axis

In the point ( (9,0) ), (y=0), so it lies on the (x)-axis. This identification is very useful for intercepts.

Correct answer: B. (14, 0) और (0, 14)

To find the x-intercept, put y=0 in the equation, giving x=14 and the point (14, 0). To find the y-intercept, put x=0, giving y=14 and the point (0, 14). Therefore, option B is correct. Exam tip: set the other coordinate equal to zero to find an intercept.

Correct answer: C. (8, 0) and (0, 4)

For a straight line, any two distinct points satisfying the equation can be used. Put y = 0: 2x = 16, so x = 8, giving (8, 0). Put x = 0: 4y = 16, so y = 4, giving (0, 4). Thus option C gives the two intercepts. The other pairs contain at least one point that does not satisfy the equation.

Correct answer: D. Both are parallel

The governing geometric concept is the representation of an equation of the form x = a. Such an equation describes a vertical line: the x-coordinate remains fixed at a, while y can take any real value. Consequently, x = 2 and x = 8 are both vertical lines, but they occupy different positions. No point can have x-coordinate 2 and 8 simultaneously, so the lines have no common point. Distinct vertical lines are parallel; therefore option D is correct. They do not intersect or coincide because their constants differ. The x-axis is represented by y = 0, not by x = a, so option C is also incorrect.

Correct answer: B. No solution

A pair of linear equations has a solution at every common point of their graphs. The equation y=2 is a horizontal line containing points whose y-coordinate is 2, while y=9 is another horizontal line at height 9. Because 2 and 9 are different, no point can lie on both lines: a common point would need to have y=2 and y=9 simultaneously. The lines are distinct and parallel, so the system has zero solutions. Hence option B is correct. Infinitely many solutions would occur if both equations represented the same line, one solution would require intersecting lines, and two solutions cannot occur for two distinct linear lines.

Correct answer: C. 10

In an ordered pair (x, y), the first coordinate represents x and the second coordinate represents y. Therefore, in (3, 10), the value of y is 10. Option 3 represents the value of x, not y. In an exam, remember that the coordinates of an intersection point are written in the order (x, y).

Correct answer: D. 12

In an ordered pair \((x,y)\), the first coordinate represents \(x\) and the second represents \(y\). Therefore, in \((12,1)\), \(x=12\). Exam tip: Always read the coordinates in their given order.

Correct answer: A. Infinitely many solutions

The direct answer is option A: infinitely many solutions. Compare the equations: x + y = 5 and 2x + 2y = 10. Multiplying every term of the first equation by 2 gives exactly the second equation. Therefore both equations represent the same line, not two different lines. Every point on that common line satisfies both equations, so there are infinitely many ordered-pair solutions. Option A is correct. Option B, no solution, applies to distinct parallel lines, which these are not. Option C, one solution, applies when two non-parallel lines intersect at one point. Option D, only two solutions, is not the graphical classification for coincident linear equations; a common line has infinitely many points. Memory cue: one equation being a nonzero multiple of the other means coincident lines and infinitely many solutions.

Correct answer: B. Parallel

Multiplying the first equation by (2) gives (2x-2y=12), which differs from (2x-2y=15). Therefore, the lines are parallel.

Correct answer: C. (4, 1)

Substituting x=4 in x+4y=8 gives 4+4y=8. Thus, 4y=4 and y=1, so the point is (4, 1). Option A also has x=4, but 4+4×2=12, which does not equal 8. Exam tip: verify a point on a line by substituting both its coordinates into the original equation.

Correct answer: A. (4, 1)

Substituting \(y=1\) in \(4x+y=17\) gives \(4x+1=17\), so \(4x=16\) and \(x=4\). Hence, the ordered pair is \((4,1)\). Option B reverses the order of the coordinates, while options C and D do not satisfy the equation. Exam tip: verify a point by substituting both coordinates into the original equation.

Correct answer: C. \((2,2)\)

The point of intersection must satisfy both equations. Subtracting the equations gives \(x-y=0\), so \(x=y\). Substituting this in \(x+2y=6\) gives \(3x=6\), hence \(x=y=2\). Therefore, the lines intersect at \((2,2)\). Exam tip: verify a candidate point in both equations; \((4,1)\) satisfies the first equation but not the second.

Correct answer: A. \((4,2)\)

Subtracting the first equation from the second gives \(x=4\). Substituting this into \(x+3y=10\) gives \(4+3y=10\), so \(y=2\). Therefore, the lines intersect at \((4,2)\). The distractor \((2,4)\) satisfies the first equation but gives \(2(2)+3(4)=16\neq14\), so it is not the common solution. In an exam, verify an intersection point in both equations.

Correct answer: B. The scale should be clear enough to plot points correctly

A clear scale helps plot points at the correct places. A wrong scale can cause mistakes in reading the intersection point.

Correct answer: B. Reading the coordinates in reverse order

The coordinates of a point are always read in the order \((x,y)\): the x-coordinate first and the y-coordinate second. Therefore, reading \((5,3)\) as \((3,5)\) means reading the coordinates in reverse order. Naming the axes or choosing the correct scale does not describe this particular error. Exam tip: record the horizontal-coordinate value first, followed by the vertical-coordinate value.

Correct answer: C. ((0,0))

The governing test is direct substitution: a point lies on a line if its coordinates make the equation true. For the origin (0,0), x+y=0+0=0, so the equation is satisfied and the line must pass through that point. Therefore option C is correct. Checking the distractors confirms the result: (1,1) gives 2, (0,1) gives 1, and (1,0) gives 1; none of these equals 0. In fact, x+y=0 can also be written as y=−x, a line through the origin with slope −1. The phrase “must pass” asks for a guaranteed point, and the origin is guaranteed by the zero constant term.

Correct answer: B. \((3,2)\)

For the point \((3,2)\), substitute \(x=3\) and \(y=2\): \(2x-3y=2(3)-3(2)=6-6=0\). Hence, the point lies on the line. For example, substituting \((2,1)\) gives \(4-3=1\), so it does not lie on the line. In an exam, the quickest method is to substitute each point into the equation.

Correct answer: C. When lines intersect at one point

Exactly one solution is obtained when both lines intersect at one point. That point is the common solution of both equations.

Correct answer: C. When the two lines are distinct and parallel

Distinct parallel lines never intersect, so they have no common point and the pair of equations has no solution. Coincident lines have infinitely many solutions, while intersecting lines have one unique solution. Exam tip: lines with the same slope but different intercepts represent no solution.

Correct answer: B. When lines are the same line

A pair of linear equations is represented by two straight lines. A solution is a point that lies on both lines at the same time. If the two equations produce exactly the same line, every point on that line belongs to both graphs. Consequently, every one of those points satisfies both equations.

Since a straight line contains infinitely many points, the pair has infinitely many common solutions. Therefore, option B, “when the lines are the same line,” is correct. Distinct parallel lines never meet and give no solution, while ordinary intersecting lines meet at one point and give one solution. Merely cutting the axes does not determine the number of common solutions.

Correct answer: A. \((4,4)\)

Subtracting the second equation from the first gives \(y=4\). Substituting this into \(x+y=8\) gives \(x=4\), so the graphs intersect at \((4,4)\). Options B and D satisfy the second equation but not the first. Exam tip: Verify a graphical solution by substituting both coordinates into both equations.

Correct answer: A. (x = 4, y = 6)

The point where two lines intersect is the common solution of both linear equations. Therefore, the point (4, 6) gives x = 4 and y = 6. Option B reverses the order of the coordinates. In an exam, remember to write an ordered pair in the order (x, y).

Correct answer: A. ( (5,8) )

The direct answer is option A, (5,8). The point must satisfy x+y=13, and x is given as 5. Substitute x=5: 5+y=13. Subtract 5 from both sides: y=8. Therefore the ordered pair is (5,8), with x written first and y second. Option B, (8,5), reverses the coordinates; its sum is 13, but it does not have x=5. Option C, (5,13), has the correct x but gives sum 18, not 13. Option D, (13,5), reverses the required roles and gives sum 18. The key is to use both conditions: the equation and the specified x-value. Memory cue: ordered pairs are always written (x,y), never (y,x).

Correct answer: B. 8

Substituting \(x=3\) gives \(2(3)+y=14\), so \(6+y=14\) and therefore \(y=8\). Option A results from not completing the subtraction correctly after finding \(2x=6\). For graphing, the corresponding ordered pair is \((3,8)\).