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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)
Hii1) find out their slopes and equate for all the pair of points . You will get the answer2) Just equate the value of slope m = (y2-y1)/(x2-x1). You will get the answer
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