You can put this solution on YOUR website!
To solve by substitution:
1. Leave first equation alone for now.
2. Solve for y on the second equation.
3. Plug in this value into the first eqn to find x
4. Once you know the x value, plug it again in the forst equation to find y.
Since you've already done the problems, I'm only posting one so you can verify the steps and results.
... now multiply by 7 to get rid of fraction
... now combine like terms
Here are your answers: