How do you solve this system of equations: #-5x - 7y = - 15 and 5x + 9y = 5#?
1 Answer
Dec 7, 2017
Explanation:
Add the two equations together first:
Adding both left sides of each equals sign together, the x values cancel out (
Adding both right sides of the two equations
That leaves us with
then divide both sides by 2 to get:
You can then fill that into either of the original equations to find x
Add 45 to both sides
divide both sides by 5
It's also recommended to check your answer in the other equation:
Correct! :)