2x + 3y=5
x - 2y= -7
x - 2y= -7
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x -2y = -7
cara subtitusi
x - 2y = -7 -----------> x = 2y - 7
2x + 3y = 5
2(2y - 7) + 3y = 5
4y - 14 + 3y = 5
7y = 22
y = 22/7
x = 2y - 7
= 2(22/7) - 7
= 44/7 - 49/7 = -5/7