Question

resolva o sistema 2x-3y=7
x-y=4

Answer 1

2x-3y=7
x-y=4
---------
2(y+4)-3y=7
2y + 8 - 3y=7
8 - y = 7
- y = -1 .(-1)
y = 1
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x-y = 4
x - 1 = 4
x = 5