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

ax + by = c

a = b = c =  
x -2 -1 0 1 2 3 4 5 6
y

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

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