Q20 of 50 Page 4

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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