Posted by Josh on Wednesday, January 20, 2010 at 7:01pm.
Find all the points having an x coordinate of 2 whose distance from the point (-1,-5) is 5.
so far i have
how do i simplify the rest of the equation so i can find x. do i foil it out? thanks.
- Trig/Math - MathMate, Wednesday, January 20, 2010 at 8:09pm
Geometrically, you are looking for the intersection of a vertical line (x=2) with a circle centred at (-1,-5) with a radius of 5.
Line L1: x=2
Circle C1: (x-(-1))²+(y-(-5))²=5²
Substitute x=2 in C1:
(y+5) = ±4
So there are two solutions, y=-9 or y=-1
- Trig/Math - Josh, Wednesday, January 20, 2010 at 10:27pm
- Trig/Math :) - MathMate, Thursday, January 21, 2010 at 12:11am
Do give a check on the distance between the centre and the intersection points to complete the question.
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