Question

(2x + y = 33
(x-3y=-29​

Answer 1

Resposta:

(2x + y = 33

(x-3y=-29

$y = 33 - 2x \\ \\ x - 3 \times (33 - 2x) = - 29 \\ x - 99 + 6x = - 29 \\ 7x - 99 = - 29 \\ 7x - 99 + 29 = 0 \\ 7x - 70 = 0 \\ 7x = 70 \div (7) \\ x = 10 \\ \\ y = 33 - 2x \\ y = 33 - 2 \times 10 \\ y = 33 - 20 \\ y = 13 \\ \\ (x.y) = (10.13)$