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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.
Simultaneous equations and linear equations, after studying this section, you will be able to: 1  solve simultaneous linear equations by substitution. 2  solve simultaneous linear equations by elimination. 3  solve simultaneous linear equations using straight line graphs.