1.

The line containing the points (c, 8) and (a, 0) in perpendicular to the line containing the points (– c, c) and (3c, a). If a = 10, then what is the value of a + c? (A) 22 (B) 12 (C) 10 (D) 6

Answer»

(B) 12

A(c,8) , B(a.0) , C(-c,c) , D(3c , a)

Slope of (AB) × slope of CD = –1

∴ c = 2

∴ a + c = 12



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