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y = 6-3x (pers 1)
substitusi pers 1 ke pers 2
4x - 5y = -11
4x - 5(6 -3x) = -11
4x -30 +15x = -11
4x+15x = -11+30
19x = 19
x = 19/19
x = 1
y = 6-3x
y = 6-3(1)
y = 6-3
y = 3
Hp (1,3)
4x-5y=-11. || x1
____________
15x+5y=30
4x-5y=-11
____________ +
19x = 19
x = 1
3 (1) + y = 6
y = 6 - 3
y = 3