Question

4x+y=13
x+-y=2
?x= ?

Answer 1

I want to help you lead through this problem. Let's start by looking at the two equations, add the left and right sides and tell me what you get.

Answer 2

17?

Answer 3

Ok... got that...

Answer 4

Let me try to illustrate this
4x+y=13
x -y= 2 See how I lined the problem up? It kind of looks like a giant equation.
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4x+x+y-y=15. We can add the left side and the right side. See what I did?

Now let's combine the terms.
5x+0=15. The y's cancel out because y-y=0, we are left with...
5x=15
x=3.

Now let's plug x=3 in to one of our equations
x-y=2
3-y=2
3=y+2
3-2=y
y=1.

Answer 5

Thank you, that was very helpful!