Solve and check each of the following problems using the substitution method.

1. 3x + y = 5

-2x + 3y = 4

2. y = 5x

2x + y = 28

3. x + 3y = 23

3x - 2y = 3

4. x = 1/5y

3x + 2y = 26

I need help in figuring out the answers to these problems. If you could please explain to me how to solve it I'd appreciate it very much.