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Grade 12Analytical Geometry

1)If (1,a) , (3,9a) , (4,b) , (6,18) are collinear then (a,b/a)=
A.(6,13) B.(6/7,13) C.(6/7,13/7) D.(21,13)
2)If A,B,C are collnear points A=(3,4) , B=(7,7) and AC = 10 then C =
A.(5,2) B.(5,-2) C.(-5,-2) D.(-5,2)

Profile image of Raghav Rao
9 Years agoGrade 12
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1 Answer

Profile image of Sourabh Singh
9 Years ago
Hii

1) find out their slopes and equate for all the pair of points . You will get the answer

2) Just equate the value of slope m = (y2-y1)/(x2-x1). You will get the answer

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