Question

Quanto e {2x-3y=30
..............,.....{5x+y=10

Answer 1

{2x-3y=30
{5x+y=10 (+3)

2x - 3y = 30
15x + 3y = 30 (+)
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17x = 60
x = 60/17

5x + y = 10
5.60/17 + y = 10
300/17 + y = 10
(300+17y)/17= 17.10/17
300+17y= 170
17y = 170 - 300
17y = - 130
y = - 130/17
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