Question

X-y=4 2x-4y=13resposta e calculo

Answer 1

X-y=4

2x-4y=13

x - y = 4

x = 4 + y

2x - 4y = 13

2.(4 + y) - 4y = 13

8 + 2y - 4y = 13

8 - 2y = 13

8 - 13 = 2y

- 5 = 2y

2y = - 5

y = - 5/2

x = 4 + y

x = 4 - 5/2

2x/2 = (2.4 - 5)/2

2x = 8 - 5

2x = 3

x = 3/2

R.:

x = 3/2; y = - 5/2