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Most linear equations are functions (that is, for every value of x, there is only one corresponding value of y). When you assign a value to the independent variable, x, you can compute the value of the dependent variable, y. You can then plot the points named by each (x,y) pair on a coordinate grid.
0 0. To solve a system of linear equations by graphing, you will need to graph both lines. The 3 possible solutions as mentioned in the problem are: one solution, no solution, or an infinite number of solutions. When you graph the 2 lines, you will have one of 3 different possibilities.