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x - y = 2.... x = 2 + y
x + y = 3 ....>subtitusikan x
(2 +y) + y = 3
2 + 2y = 3
2y = 1
y = 1/2
2 + y = x
4/2 + 1/2 = x
x = 5/2 atau 2 1/2
x - y = 2
------------------>
2y = 5
y = 5 / 2
y = 2,5
substitusikan
x + 2,5 = 3
x = 3 - 2,5
x = 0,5