Use the graph below for this question:

graph of parabola going through negative 1, 5 and negative 2, 7.

What is the average rate of change from x = −1 to x = −2?

2
−2
4
−1

Question

Use the graph below for this question:

graph of parabola going through negative 1, 5 and negative 2, 7.

What is the average rate of change from x = −1 to x = −2?

 2
 −2
 4
 −1

anonymous · Answer

HELPPPPp!!!!!!!!!!

zehanz · Answer

Imagine what happens if you go from x = -1 to x = -2: 
At x = -1 you are at height 5, at x = -2 you are at height 7.

anonymous · Answer

2

zehanz · Answer

True, and because you move only one unit (to the left) the average rate of change would also be 2.
But: rate of change is measured going from left to right. The question should have been (imo) what is the average rate of change between x=-2 to x=-1.

It is -2.

anonymous · Answer

That you so much you really are a life saver!!!

zehanz · Answer

If you like to use a formula: avg rate of change = delta y / delta x,

So: $\dfrac{y_2-y_1}{x_2-x_1}=\dfrac{7-5}{(-2)-(-1)}=\dfrac{2}{-1}=-2$

zehanz · Answer

yw!