Posted by Jean on Saturday, December 11, 2010 at 9:49am.
Did you know that the slope of a line is the tangent of the angle that the line makes with the x-axis?
So they are telling us that the slope of the line is 1/3
so (y+5)/(x-12) = 1/3
cross-multiply and simplify if you want the actual equation of the line.
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