Question

A)-x+y=20
x+y=2

b) y=15+x
x+y-3

Answer 1

Resposta:

2y=22

y=22/2

y=11

logo...

x+11=2

x=2-11

x=-9

b) y-x=15

x+y=3

2y=18

y=18/2

y=9 logo

x+y=3

x+9=3

x=3-9

x=-6

Explicação passo-a-passo: