Jawapan

2016-03-19T10:06:30+08:00
7x - 2y = -3
-2y = -3 -7x
y = ( -3 -7x ) /-2

substitute y

14x + y = 14
14 x + ( -3 -7x ) / -2 = 14
-28x - 3 -7x = -28
-35x = -25
× = 5/7

when x = 5/7
y = (-3-7x) / -2
y = ( -3 -7(5/7)) / -2
y = ( -8 ) / -2
y = 4