Wednesday
March 4, 2015

Homework Help: math

Posted by chris on Monday, November 1, 2010 at 5:07am.

I need help with parametric equations, locus problems, tell me how to solve all questions if you can. Need help with one below:

Tangents are drawn to a parabola x^2=4y
from an external point A(x1,y1) touching the parabola at P and Q
(a) Prove that the mid point, M, is the point (x1,0.5 x1^2-y1)
and
(b) if A moves along the straight line y=x-1 find the equation of the locus M

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