The coordinates of the vertices of triangle abc are a(-1,3), b(1,2) and c(-3,-1). determine the slope of each side of the triangle and use that information to determine if the triangle is a right triangle or not.

Check the picture below.

so... let's check those slopes then.  Notice the triangle, the triangle "seem" to have a right-angle at the vertex A, namely, the slopes of AB and AC are perpendicular if that's true.

Now, when the product of two perpendicular slopes is -1.

so, let's check the slopes then.







now, let's check the product of AB and AC,