How do you solve the system of equations 4x + y = - 4 and - x + y = 1?

1 Answer
Mar 27, 2017

(-1,0)

Explanation:

The key here is to eliminate any one variable and evaluate the second variable

4x+y=-4 Let this be equation 1

-x+y=1 Let this be equation 2

On multiplying equation 2 by 4 and adding that to equation 1

4x+y=-4
+
-4x+4y=4
------
5y=0
y=0

Plugging y=0 in any equation we get x=-1