The points with position vectors 60i+3j , 40i-8j , ai-52j are collinear if

Answers (1)

Solution:    Three points  A(veca),B(vecb),C(vecc)    are collinear if  vecABparallel vecAC

           \ \ Rightarrow hspace1cm vecAB=-20i-11j ;vecAC=(a-60)i-55j \ \ Rightarrow hspace1cmvecABparallel vecACRightarrow fraca-60-20=frac-55-11Rightarrow a=-40

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