Question
Find all the points having an x-coordinate of 9 whose distance from the point (3, -2) is 10.
(9, 6), (9, -10)
(9, 13), (9, -7)
(9, -12), (9, 8)
(9, 2), (9, -4)
(9, 6), (9, -10)
(9, 13), (9, -7)
(9, -12), (9, 8)
(9, 2), (9, -4)
Answers
Reiny
So ll the points whose distance from the point (3, -2) is 10 would be the circle
(x-3)^2 + (y+2)^2 = 100
when x = 9
36 + (y+2)^2 = 100
(y+2)^2 = 64
y + 2 = ± 8
y = 6 or y = -10
looks like choice #1
(x-3)^2 + (y+2)^2 = 100
when x = 9
36 + (y+2)^2 = 100
(y+2)^2 = 64
y + 2 = ± 8
y = 6 or y = -10
looks like choice #1