Q15 of 184 Page 10

Find the value of P are the points (2, 1), (p, -1) and (-1, 3)collinear?

Given A(2, 1), B(p, -1) and C(-1, 3) are collinear


To find: Find the value of p


So, The given points are collinear, if are (∆ABC)=0


= Area of triangle =


Then,


= 2(-4)+p(2)-2=0


= -8 +2p -2 = 0


= 2p = 10


Hence, p =


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