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5x - 15y = 15 |x2|
10x + 5y = 15
10x - 30y = 30
---------------------- -
35y = -15
y = -15/35
y = -3/7
10x + 5y = 15
10x + 5 (-3/7) = 15
10x - 15/7 = 15
10x = 15 + 15/7
10x = 105/7 + 15/7
10x = 120/7
x = 120/7 x 1/10
x = 12/7 = 1 5/7
3x + 2y =
3 (12/7) + 2 (-3/7)
36/7 - 6/7 = 30/7 = 4 2/7
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