Question

4x+4y=82
2x+7y=106 sistema para agr

Answer 1

4x + 4y = 82
2x + 7y = 106 ( * -2)

4x +4y = 82
-4x-14y=-212
0-10y=-130 ⇒ -10y = -130 ⇒ y = -130/-10 ⇒ y = 13

4x + 4y = 82 ⇒ 4x + 4(13) = 82 ⇒ 4x + 52 = 82 ⇒ 4x = 82 -52 ⇒ 4x = 30 ⇒
x = 30/4 = 7,5

Resp.: y=13 e x=7,5