Question 1

The coordinates of points A and B are (-3.0,5.0) and (9.0,2.0) respectively. Find the slope of the line AB.

You can use the following slope formula to help you:

Select and check your answer...

A. -4
B. -0.25
C. 0.25
D. 4

First, we have to assign (x₁,y₁) and (x₂,y₂) with the given coordinates.

Now, referring to the picture on the right, we can assign the x and y coordinates of point A as:

                x₁ = -3.0   and   y₁ = 5.0


Similarly, for point B, we can assign its x and y coordinates as:

                     x₂ = 9.0   and   y₂ = 2.0

Now, we substitute y₂ and y₁ into the formula, we get:






Next we, substitute x₂ and x₁ into the equation, we get:

Now, simplify the numerator and denominator to find the slope:

The slope is equals to -0.25. Clearly, the answer is B.