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Lines: plotting
Choose values for a and observe the values of

y = ax

a =          
x -2 -1 0 1 2 3 4 5 6
ax


Here is a plot of some points from a straight line equation.



Here you can move the point with your mouse (right-click to clear) and observe how the coordinates change. What is the equation that matches this graph?
What you should understand
Equations like these are called linear equations. The values of y always form a simple sequence. They go up by the same amount each time. This amount is a. When you plot the values on a graph the points will lie on a straight line.


a1 a2 a3 a4
b1 b2 b3 b4
c1 c2 c3 c4
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