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Lines: y = mx+c
Work out the equations of each line displayed.

Enter equations into the second blank window and click on New Functions.
(Each equation is of the form y = mx+c, where m and c are positive or negative numbers.)
a1 a2 a3 a4
b1 b2 b3 b4
c1 c2 c3 a1
a1 a2 a3 a4
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