Question

(Combining Equations )What is the result of adding these two equations ? 2x + 7y = 4 -2x -8y = -2

Answer 1

To add these equations you just have to combine like terms on the same side of each equation, like this:

As you can see, we got 2x + 7y -2x -8y on the left, by combining like terms and performing the subtraction on the right side, we get:

2x-2x+7y-8y=2

0-1y=2

-y=2

Then, after adding these equations, we get -y = 2