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substitusi
2x + y = 5
2x + (2x - 7) = 5
4x = 12
x = 3
y = 2(3) - 7 = - 1
JAWAB:
2x-y=7
2x=7+y
x=7/2 + y/2
2x+y=5
2(7/2 + y/2) + y = 5
7+y+y=5
7+2y=5
2y=5-7
2y=-2
y=-1
x=7/2 + y/2
x=7/2 + (-1/2)
x=6/2
x=3