Posted by joshua on Wednesday, January 5, 2011 at 9:17pm.
The slope-intercept form is y = mx + b
7 = m*3 + b
3 = m*9 + b
Subtract second equation from the first, to eliminate the unknown b.
4 = -6m
m = -2/3
7 = -2 + b
b = 9
y = -(2/3)x + 9
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