Question

Solve the following system of equations.

2x + y = 3
x = 2y - 1

Answer 1

2(2y-1)+y=3
4y-2+y=3
5y=5
y=1
x=2(1)-1
x=1

Answer 2

First, change the second equation to match the first.
You should end up with x-2y=-1
Now, multiply it by -2 to get the following:
-2x+4y=2
This allows you to eliminate the x in both equations.
Add the ys and the constants, then divide by the coefficient of y to get the y value.
Then, take the value and plug it in to either equation to get x.