Question

if (a,-1),(1,1)and (11,4) are collinear ,then find 'a'?

Answer 1

Hy For collinear Given points (a,1)(1,-1)(11,4) Now x1(y2-y3)+x2(y3-y1)+x3(y1-y2)=0 a(-1-4)+1(4-1)+11(1+1)=0 -5a+3+22=0 -5a +25=0 5a=25 a= 5 ans