1) how do the solutions to an equation relate to the graph of the equation?

2)how do you solve a system of equations approximately using graphs and tables?

One: Graphs help you solve equations, and equations help you solve graphs. 
Because the graph is a diagram of the equation, showing at its simplest the y answer for each value of x.

Two: You have to solve for y, graph it, and then find where the lines intersect.You can take a table and put in all the x and y valuesThen graph it.. And see where it intersectsBecause usually these equations are lines.