How do you solve the system -2x + 2y= -5 and x + y= -5?
We need to find one of the variables. Since Eq2 already has variables with coefficients of
Now we can use Eq3 by substituting it into Eq1. We cannot substitute into Eq2, as we have already used this equation to derive a result!
Eq3 -> Eq1:
We now have a value for
Now we have values for both