How do you solve the following system of equations?: x + y = 4, 2x + y = 8 ?

Dec 23, 2015

x=4
y=0

Explanation:

x+y=4
2x+y=8

By subtraction , we have

-x=-4
X=4

By substituting x=4 to any of the equation

4+y=4
y=0