Question

determine the points (1,5),(2,3),(-2,-1) are collinear​

Answer 1

Answer:

You can simply get the answer by applying the formula for the area of the triangle. If the area comes out as zero, then the points are collinear and if area of the triangle is not equal to zero, then the points are not collinear.

Step-by-step explanation:

Area of the triangle= 1/2[x1(y2-y3)+x2(y3-y1)+x3(y1-y2)]

x1= 1

x2= 2

x3= -2

y1= 5

y2= 3

y3= -1

I think you can solve by your own now.

Answer 2

Step-by-step explanation:

formula : d√(x2-x1)^2+(y2-y1)^2

AB=(1,2) (2,3)

d=√(x2-x1)^2 (y2-y1)^2

d=√(2-1)^2 (-2)^2

d=√1^2+(-2)^2

d=√1+4

d=√5

BC=(2,3) (-2,-11)

CA=(-2,-11) (1,5)

solve by the same method