How do you solve #x + y = -7# and #3x + y = -9#?
You could solve this system of equations by using the multiplication method.
To do that, start by multiplying both sides of the first equation by
The system of equations will now be
Next, add left sides and the right sides of the two equations separately to eliminate the terms that contain
Divide both sides of the equation by
Now that you know the value of
This is equivalent to
Now divide both sides of this equation by
The two solutions are