Question

2. Resolva os sistemas {×-2y=7
{4×+3y=6

Answer 1

{x - 2y = 7 x = 7 + 2y

{4x + 3y = 6

4(7 + 2y) + 3y = 6

28 + 8y + 3y = 6

28 + 11y = 6

11y = 6 - 28

11y = - 22

y = - 22/11

y = - 2

x = 7 + 2 . (- 2)

x = 7 - 4

x = 3

S = {(x , y) = (3 , - 2)}

att. yrz