# Check which of the following are linear equations in two variables:(i) x2 – y = 2(ii) x + y = 3(iii) xy = 9

A linear equation in two variables is of the form: ax + by + c = 0

(i) x2 – y = 2

There should not be any power other than one on variable.

So, it is not a linear equation.

(ii) x + y = 3

It can be writtenn in the form of ax + by + c = 0

(iii) xy = 9

This equation is not linear as (xy) can not be written together in linear equations.

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