Question

resolva :
a) X+2y-5
x-2y=7

b) -x+y=8
x+y=6

Answer 1

Explicação passo-a-passo:

a)

x+2y= - 5

x-2y=7

2x = 2

x = 2/2

x = 1

x + 2y = 5

1 + 2y = 5

2y = 5 - 1

2y = 4

y = 4/2

y = 2

b)

-x+y=8

x+y=6

2y = 14

y = 14/2

y = 7

x + y = 6

x + 7 = 6

x = 6 - 7

x = - 1