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Circle C and line k lie in the xy plane. If the circle C is

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Circle C and line k lie in the xy plane. If the circle C is  [#permalink]

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New post 11 Oct 2008, 00:49
00:00
A
B
C
D
E

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Circle C and line k lie in the xy plane. If the circle C is centered at the origin and has radius 1, does line k intersect circle C?
a. The x intercept of line k is greater than 1
b. The slope of line k is -1/10

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Re: Circle DS  [#permalink]

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New post 11 Oct 2008, 02:09
the answer is (E)

we need to know the constant b in

y=ax+b

:)
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Re: Circle DS  [#permalink]

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New post 11 Oct 2008, 02:34
How do you determine if a line intersects the circle?
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Re: Circle DS  [#permalink]

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New post 11 Oct 2008, 05:37
(a) x intercept is > 1. So it is possible that the line can intersect the circle or not intersect the circle.
(b) The -ve slope gives us the direction of the circle. But no clear intersection to the circle.

together they don't give the intersects.

So E.

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Re: Circle DS &nbs [#permalink] 11 Oct 2008, 05:37
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Circle C and line k lie in the xy plane. If the circle C is

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