### Home > APCALC > Chapter 3 > Lesson 3.3.1 > Problem3-87

3-87.

Using the statement below, identify where the slope of the function is positive, negative, and zero.

• “The function increases from negative infinity until it reaches a peak at $x = −4$ then decreases until $x = 1$ where the graph turns and then increases until positive infinity.”

When describing a function, how do the words 'increase' and 'decrease' connect with slope?