diketahui sistem persamaan liniear 2x + 3y = 2 dan x -2y = 8. nilai dari ( x-y ) yang memenuhi adalah...

2x + 3y =2 | x 1 |
x - 2y = 8 | x 2 |
jadi
2x + 3y = 2
2x - 4y = 16
_________ -
0 + 7y = -14
y = -14 / 7
y = -2

Substitusi
2x + 3(-2) = 2
2x - 6 = 2
2x = 2+6
2x = 8
x = 4

x = 4, y= -2
x-y
4- (-2) = 4 + 2 = 6