Me and my son have been struggling to find the set of solutions. We need answers

If you and your son are graphing liner equations, then all you need to do is make a table, selecting different values for x and calculating for y. For example:

If your equation were y = 3x - 1 then you could choose 0 for x and then y would equal -1 and your solution set would include (0, -1) because of this: 3 times 0 is 0 and 0 minus -1 is -1. You could choose 1 for x and then your value for y would be 2 and your set would include (1, 2) because 3 times 1 is 3 and 3 minus 1 is 2....

You would solve your equation in the same manner. I hope this helps and good luck!