Question

7x + y= -2 check whether the point (2,1) is a solution set of the given equation

Answer 1

let x = 2 and y = 1
L.H.S. = 7(2) + 1
= 14 + 1
= 15

R.H.S. = -2

therefore L.H.S. not equal to R.H.S.
therefore it is not solution set of given equation.