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Question

Identify which of the following are linear equations in two variables.

(i) 3x - 2y = 15

(ii) 8x - 7y = 0

(iii) 1x + 1y = 17

(iv) 6x + 3y = 6xy

(v) 4x + 3y = 14

(vi) 32p - 32q = 48

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Solution

A linear equation in two variables x and y is of the form ax+by =c, where a, b and c are real numbers, such that a0, b0.(i) It is a linear equation in two variables.(ii) It is a linear equation in two variables.(iii) 1x+1y=17y+xxy=177y+7x=xy It is not a linear equation in two variables.(iv) It is not a linear equation in two variables.(v) 4x+3y=144+3yxx=144+3yx=14xIt is not a linear equation in two variables.(vi) 32p-32q=486p-6q22=436p-6q=86p-6q=8This is a linear equation in two variables.

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