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x + y x
_____ - ___ = 4
2 3
x - y y
_____ + ____ = -3
_____ - ___ = 4 /*6
_____ + ____ = -3 /*6
3x + 3y - 2x = 24
3x - 3y + 2y = -18
x + 3y = 24
3x - y = -18
x = 24 - 3y
3(24 - 3y) - y = -18
72 - 9y - y = -18
-10y = -18 - 72
-10y = -90 /:(-10)
y = 9
x = 24 - 3*9
x = 24 - 27 = -3
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x + y x
_____ - ___ = 4 /*6
2 3
x - y y
_____ + ____ = -3 /*6
2 3
3x + 3y - 2x = 24
3x - 3y + 2y = -18
x + 3y = 24
3x - y = -18
x = 24 - 3y
3(24 - 3y) - y = -18
x = 24 - 3y
72 - 9y - y = -18
x = 24 - 3y
-10y = -18 - 72
x = 24 - 3y
-10y = -90 /:(-10)
x = 24 - 3y
y = 9
x = 24 - 3*9
y = 9
x = 24 - 27 = -3
y = 9