Posted by Anonymous on Sunday, January 5, 2014 at 4:59pm.
I'm asked to solve the following system using elimination and say how many solutions there are:
4x  7y = 15
8x + 14y = 30
The answer says that there are infinitely many solutions, but I am getting 8x  14y = 30 and 8x + 14y = 30. I think they both come up as 30 and 30, so they aren't the same. Could someone please explain how to do this?

Algebra  Steve, Sunday, January 5, 2014 at 6:40pm
Just multiply everything in either of your equations by 1 to see that they are really the same equation.
2x = 4
is the same as
2x = 4