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How will the graphs of (6x-9y=15) and (2x-3y=5) be?

Answer and explanation

Correct answer: Coincident

The direct answer is C: the graphs are coincident, meaning they are the same line. Compare the equations \(6x-9y=15\) and \(2x-3y=5\). Divide every term of the first equation by 3: \((6x-9y)/3=15/3\), giving \(2x-3y=5\), exactly the second equation. Therefore every point satisfying one equation satisfies the other, so there are infinitely many common solutions. Option C is correct. Option A, parallel and distinct, would apply if the coefficients of x and y were proportional but the constants were not proportional. Option B, intersecting at one point, would mean the two equations represented different lines with different slopes. Option D, intersecting at the origin, is not possible here because the origin gives 0=15 in the first equation, which is false. Exam cue: if one complete linear equation is a non-zero multiple of the other, the lines are coincident.

Related tags

Coincident LinesInfinite SolutionsGraphical Method

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