Solve the system of equations
3x-4y=100
x/3+4y/3=100

Let's use substitution to solve.
First, get one of the variables on its own side in both equations.



Now, we want both of the equations to have the same value of x.
Let's multiply the bottom equation by 9 to accomplish this.



Now we can set the right side of both equations equal to each other (substitution)



Let's solve for y.



Now we can use  in an earlier equation to find x.

Look at the picture below
(a little bit shorter than first answer)

You just need to add 32 to 14 and get 46.