The coordinates of three points are A(-1,-6), B(3,-12) and C(k,6). Find the value of k if (a) A, B and C are collinear? (b) AB is perpendicular to AC?

Elementary Geometry For College Students, 7e
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ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
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Chapter10: Analytic Geometry
Section10.CT: Test
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The coordinates of three points are A(-1,-6), B(3,-12) and C(k,6). Find the value of k if

(a) A, B and C are collinear?

(b) AB is perpendicular to AC?

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