Posted by Audrey on Saturday, April 24, 2010 at 7:07pm.
slope = (8-4)/(4--4) = 4/8 = 1/2
It is constant for all points
so
y = .5 x + b
8 = .5(4) + b
6 = b
so
y = .5 x + 6
check that for all points like (-4,4)
4 = (.5)(-4) + 6 ???
4 = -2 + 6
4 = 4 sure enough
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