Question

Calcule x e y, sabendo que
(2x+3y) = (7)
(3x-y) = (16)

Answer 1

(2x + 3y = 7)
(3x - y = 16) ---> (-y = -3x + 16) ---> ( y = 3x - 16)
2x + 3 ( 3x - 16 ) =7
2x + 9x - 48 = 7
11x = 48 + 7
11x = 55
resposta: x = 5

y = 3 (5) - 16
y = 15 - 16
resposta : y = -1