Question

if 2x+3y+4=0 and x-5y=11, then x=?

Answer 1

$2x + 3y + 4 = 0 \: \: \ \: .......(1)$

$x - 5y = 11$
$x = 11 + 5y \: \: \: ..................(2)$
Substitute (2) in (1)
$2(11 + 5y) + 3y + 4 = 0$
$22 + 10y + 3y + 4 = 0$
$26 + 13y = 0$
$13y = - 26$
$y = - 2$
Substitute y value in (2)
$x = 11 + 5( - 2)$
$x = 11 - 10$
$x = 1$
Verification
From (1)
2(1)+3(-2)+4=0
2-6+4=0
6-6=0
0=0