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In which condition does the graph of two lines show infinitely many solutions?

Answer and explanation

Correct answer: (\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2})

The direct answer is C: a1/a2=b1/b2=c1/c2. For equations a1x+b1y+c1=0 and a2x+b2y+c2=0, infinitely many solutions mean both graphs are the same line, called coincident lines. The coefficients of x, y, and the constant term must all have the same ratio, so all three ratios are equal. Option C is correct. Option A means the x and y coefficient ratios differ; the lines generally intersect once, giving one solution. Option B has equal x and y ratios but a different constant ratio; this gives distinct parallel lines and no solution. Option D only says one ratio is zero, which is neither the complete condition nor enough to identify coincident lines. Memory cue: equal all three ratios means same line and infinitely many solutions; equal first two but not the third means parallel and no solution.

Related tags

Linear EquationsGraphical MethodRatio ConditionInfinite Solutions

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