Question

simplifique a expressão 7xy.5x=

Answer 1

7x+y=32
5x-y=16
5x-32-7x=16
-2x-32=16
x=32-16
x=16/2
x=8

y=32-7x
y=32-7.8
y=32-56
y=24

S=(8 ,24)