What is the slope of a line that passes through the points (1, 2) and (-2, 4)? a. - 3/2 b. -2 c. -2/3 d. 2

The slope can be worked out by the equation:

So with the coordinates (1,2) and (-2,4):
                    x1 = 1   y1= 2       and        x2 = -2   y2 =4
Note that x1 and y1 use the same coordinate, vice versa with x2 and y2.
Tip: The equation can be y1-y2 and x1-y2 too (have a think why)



So the answer is 2/-3, which is the same as C) -2/3