Question

2/x = 5/y sendo x+y = 140

Answer 1

5x=2y
x=140-y

700-5y=2y

7y=700

y=700/7

y=100

x=140-y

x=140-100

x=40

espero ter lhe ajudado!

Answer 2

X+y=140 5×=2y

X+y=140(×2) tornar o y neutro

5×-2y=0

2x+2y=280 +2y-2y =0

5×-2y=0

7×=280

×=280/7

×=40

5×=2y 5.40=2y 2y=200 y=200/2 y=100