Solving systems by substitution

y=x+2 y=2x-5

So first I recommend you line it up like this:

y=x+2

y=2x-5

So, you can plug in y (probably the one that equals x+2) and the equation turns into:

x+2=2x-5

You subtract x from both sides and get:

2=x-5

then, you add 5 to both sides:

x=7

And that is what x equals.