2y+5y=10 7y=10 y=10/7
Y=5
-2
5y+8=7y 2y=8 y=4
(9,3)
(-5, 2)
The Commutative Property of Addition.
45
x=(-5y-1)/3
If: 4x = 5y Then: x = 5y/4
5y + 7 = 25y = -5y = -1
Presumably you want to know the value of y. 3y+2y+4+1 = 80 5y+5 = 80 5y = 80-5 5y = 75 y = 15