Calculate the slope of the line that connects each pair of points.
No, see solution.
Practice makes perfect
Points that lie on the same line are called collinear points. If the given points are collinear, the slope between every pair of points will be equal. To determine the slope between each pair of points, we will use the Slope Formula.
m = y_2-y_1/x_2-x_1We will calculate the slope between S and T, T and X, and S and X. Let's start with S and T.
We can calculate the other two slopes in the same way. When we substitute the values into the Slope Formula, it does not matter which point we choose to use as (x_1,y_1) or (x_2,y_2).
Points
y_2-y_1/x_2-x_1
m
S (- 3,4), T (0,2)
2- 4/0- (- 3)
- 2/3
T (0,2), X (- 3,0)
0- 2/- 3- 0
2/3
S (- 3,4), X (- 3,0)
0- 4/- 3- (- 3)
undefined
Notice that first two pairs have a different slope between them. Thus, the points do not lie on the same line.
