Question

A) (x-y=1
(x+y=9

B) (x+y=5
(4x-y=0

Answer 1

Explicação passo-a-passo:

x - y = 1

x + y = 9

________+

2x = 10

x = 10/2

x= 5

x - y = 1

5 - y = 1

5 - 1 = y

y = 4

x + y= 5

4x - y = 0

________+

5x = 5

x = 5/5

x= 1

x+ y= 5

1 + y = 5

y = 5-1

y= 4