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-3x + 7y = 13
-1x + 4y = 8
-1x = 8 - 4y
x = -8 + 4y
4y = 8 + x
-3x+7y=13
2x=-5 + 3y I:2
-3x + 7y=13
x=-2,5 + 1,5y
-3x + 7y=13
-3(-2,5 +1,5y) + 7y=13
7,5 - 4,5y + 7y=13 I-7,5
2,5y=5,5 I: 2,5
y=2,2
x=-2,5 + 1,5 *2,2= 2,5 + 3,3= 5,8
x=5,8
y=2,2