Question

a- (X+Y=7
(X -Y=1

b- (X+Y=21
(X-Y = 15​

Answer 1

Resposta:

a)x+x=2x

7+1=8

y-y=0

x=8/2

x=4

y=3

b)2x=36

x=36/2

x=18

18+y=21

y=21-18

y=3