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For prices of two items, the equations (4x+3y=125) and (8x+6y=260) are formed. What type of system is this?

Answer and explanation

Correct answer: Inconsistent

For two equations \(a_1x+b_1y=c_1\) and \(a_2x+b_2y=c_2\), if the ratios of the coefficients of \(x\) and \(y\) are equal but the ratio of the constants is different, the lines are distinct and parallel. They never meet, so the system is inconsistent and has no solution. This condition must be checked carefully rather than judging only from one coefficient.

Here, \(4/8=3/6=1/2\), but \(125/260=25/52\), which is not \(1/2\). Thus the variable coefficients are proportional while the constants are not. The equations represent two different parallel lines, so no pair of prices satisfies both equations simultaneously. Hence the system is inconsistent, and option C is correct.

Related tags

Linear EquationsWord ProblemInconsistent

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