Question

x+y=80, y-x=20 then y=?​

Answer 1

Answer:

y = 50 and x = 30

Step-by-step explanation:

given

x+ y = 80

y- x = 20

add both equations

(x + y ) + ( y - x ) = 80 + 20

x + y + y - x = 100

2y = 100

y = 50

put this value in first equation

x + y = 80

x + 50 = 80

x = 80 - 50

x = 30

so we get x = 30 and y = 50