I haven't learned about increasing/decreasing intervals yet, so I'm a little confused about this. Would the interval be where the line is located? Would the decreasing interval on the first one be y=-3? Please help me! Sorry

Guest Jan 16, 2019

#1**+1 **

Increasing interval = where does graph rise???

Decreasing interval = where does the graph fall ???

Note that the intervals are stated along x.....but....we look at y to determine if the graph rises or falls

And we read the graph from left to right

First one :

This graph never rises......

So....the decreasing interval is ( - inf, inf)

Second one

Increasing interval = (-2, inf) Note that when x > -2....the graph rises

Decreasing interval = (-inf, - 2) Note that when x < -2 .....the graph falls from (-inf, -2)

Third one

This graph never decreases.....we have a vertical asymptote at x = -2

So it increases from (-inf, -2) and (-2, inf)

Hope this is clear....

CPhill Jan 16, 2019