Given a linear curve, the value on the y-axis changes from 120 to 100 when the value on the x-axis changes from 10 to 20, then the slope of that curve is
A) -20.
B) +20.
C) -2.
D) +2.

Question

Quizplus · Accepted Answer

The slope of a linear curve is defined as the change in the value on the y-axis divided by the change in the value on the x-axis.

In this case, the change in the value on the y-axis is -20 (since it decreases from 120 to 100) and the change in the value on the x-axis is 10 (since it changes from 10 to 20).

Therefore, the slope of the curve is:

slope = change in y / change in x 
slope = -20 / 10 
slope = -2

Given a Linear Curve, the Value on the Y-Axis Changes