30To check whether or not the points form a quad. we check the collinearity of the points. If any three points are collinear, it means a quad. is not formed.
For the sake of simplicity, we name the points A(-3,5), B(3,1), C(0,3) and D(-1,-4).
Slope of AB= (1-5)/(3+3)=-2/3
Slope of AC= (3-5)/0+3= -2/3
Hence, points A, B and C are collinear and thus, they do not form a quadrilateral.
