Question

7. Find the value of 2, if x = -1 and y = 2 is a solution of the equation x + 4y - 7 = 0 (a) 2 (b)3 (c) 4 (d)5​

Answer 1

$x = - 1 \: and \: \: y = 2$

$x + 4y - 7 = 0$

$- 1 + 4(2) - 7 = 0$

$- 1 + 8 - 7 = 0$

$7 - 7 = 0$

$0 = 0$

$LH.S = R.H.S$