Question

De acordo com o sistema x+4/y-1=2 e x-1/y-2=1/2, o valor de x+y é?

Answer 1

x+4/y-1 = 2 ~ x+4 = 2(y-1) ~ x+4 = 2y - 2 ~ x = 2y - 6
x-1/y-2=1/2
(2y-6)-1 = 1/2 (y-2) ~ (2y-6)-1 =y/2 - 1 ~ 2y - 6 = y/2 ~ (2y - 6)2 = y ~
4y - 12 = y ~ -12 = y - 4y ~ -12 = -5y ~ 12 = 5y ~ y = 12/5
x = 2(12/5) - 6
x = (24/5) - 6
x + 6 = 24/5
5x + 30 = 24
5x = 24 - 30
5x = -6
x = -6/5

-6/5 + 12/5 = z
-6/5 = z - 12/5
-6 = 5(z - 12/5)
-6 = 5z - 12
-5z = -12 + 6
-5z = -6
z = -6/-5
z = 6/5

x+y = 6/5 = 1,2