Question

Work the item as directed.

Find the common solution algebraically of 2x - 4y = 10 and 7x - 9y = 12.

For this do I have to make the x or y in one problem = 0 and then solve from there and then that answer I plug into the other equation to find x or y (whichever I didn't originally). And then is the answer in this form: (x,y)?

Thanks!

I sure hope I made sense..

Answer 1

Here is a video that shows how to do these problems
http://www.khanacademy.org/math/algebra/systems-of-eq-and-ineq/v/solving-systems-by-elimination
(and the ones after this one are also relevant)

Answer 2

Thanks!