Posted by andrea on Tuesday, September 22, 2009 at 7:46am.
The line you want to be perpendicular to has slope (4-1)/(-2 -4) = -1/2
That means the line you want to draw has slope m = 2. (The product of the two slopes must be -1)
Your equation will be y = 2x + b, where
4 = 2*3 + b
b = -2
y = 2x - 2 is the equation.
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