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What is the correct description of the graph of the equations (5x+17y=69) and (12x+41y=166)?

Answer and explanation

Correct answer: Lines intersecting at one point

For the coefficients of the two equations, \(\frac{5}{12} \ne \frac{17}{41}\). Therefore, the lines are neither parallel nor coincident; they intersect at exactly one point, giving a unique solution. This can also be verified using the determinant: \(5\times41-12\times17=1\ne0\). Exam tip: if \(\frac{a_1}{a_2} \ne \frac{b_1}{b_2}\), the pair of lines intersects at one point.

Related tags

Linear EquationsSolvability ConditionsIntersecting LinesUnique SolutionGraphsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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