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If (a_1/a_2=b_1/b_2=c_1/c_2) then what will appear in the graph?

Answer and explanation

Correct answer: Same line

The direct answer is option C: the same line, or coincident lines. Write the equations in the standard form \(a_1x+b_1y+c_1=0\) and \(a_2x+b_2y+c_2=0\). If \(a_1/a_2=b_1/b_2=c_1/c_2\), every corresponding coefficient is in the same proportion. One equation is therefore just a nonzero multiple of the other. Multiplying an equation does not change its set of solutions, so both equations represent exactly the same line. Every point on that line satisfies both equations; hence there are infinitely many common solutions. Option A, two intersecting lines, occurs when the first two coefficient ratios are unequal. Option B, distinct parallel lines, occurs when the first two ratios are equal but the constant ratio is different. Option D, no line, is not the result of a normal pair of linear equations with valid coefficients; each equation represents a line. Thus C is correct. Memory cue: all three ratios equal means same line and infinitely many solutions.

Related tags

Linear EquationsCoincident LinesGraph

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