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3x + y = -14
2x - 2y + 4 = 0
2x - 2y = -4
3x + y = -14 x ( 2) 6x + 2y = - 28
2x - 2y = -4 x ( 3 ) 6x + 6y = - 12
___________________________--
- 4y = -16
y = -16 ÷ (- 4 ) = 4
3x + y +14 = 0
3x + 4 + 14 = 0
3x + 18 = 0
x = 18 ÷ 3
x = 6
dit 4x - 5 y ?
4 ( 6 ) - 5(4)
= 24 - 20
= 4