Use the Substitution method to solve the system of equations.

x + y = -4
x - y = 2

what does x and y =?

Simple! We need to isolate for one variable and plug it in the other equation.

lets just take the first equation
x+y = -4

lets isolate x
x = -4 - y

now plug x value into second equation
x-y = 2
(-4 - y) - y = 2

now solve for y

once you get y than pick any one of those equations and sub that value into y and solve for x