Question

x+2y=6
2x-y=7



2x+2y=10
x-y=1​

Answer 1

Resposta:

x+2y=6

2x-y=7

$x = 6 - 2y \\ 2 \times (6 - 2y) - y = 7 \\ 12 - 4y - y = 7 \\ 12 - 5y - 7 = 0 \\ 5 - 5y = 0 \\ - 5y = - 5 \times ( - 1) \\ 5y = 5 \div (5) \\ y = 1 \\ \\ x = 6 - 2y \\ x = 6 - 2 \times 1 \\ x = 6 - 2 \\ x = 4 \\ \\ (x.y) = (4.1)$

2x+2y=10

x-y=1

x= 1+y

2.(1+y) + 2y = 10

2+ 2y + 2y = 10

2 + 4y - 10 = 0

-8 + 4y = 0

4y = 8 : (4)

y = 2

x=1 + y

x = 1+2

x = 3

(x.y) = (3,2)