I dont need the answers just explain how to do it

Part 1: The 8th grade shop class decided to make stools and chairs for their woodworking project. Each stool had 3 legs and each chair had 4 legs. They completed 7 all together and used 24 legs for the project.

The system of linear equations x + y = 7 and 3x + 4y = 24 represents the problem, where x is the number of stools and y is the number of chairs.

1. Tables – complete the following tables and find the solution.

x + y = 7 3x + 4y = 24
x y x y
1
2
3
4

Question

I dont need the answers just explain how to do it  

Part 1: The 8th grade shop class decided to make stools and chairs for their woodworking project. Each stool had 3 legs and each chair had 4 legs. They completed 7 all together and used 24 legs for the project.

The system of linear equations   x + y = 7 and 3x + 4y = 24 represents the problem, where x is the number of stools and y is the number of chairs.

1. Tables – complete the following tables and find the solution. 

        x + y = 7				     3x + 4y = 24
x	y                                            x    y
1     
2
3 
4