## bry856 one year ago how to find RATE OF CHANGE between 2 points?

1. bry856

such as (-4,-2) or (-2,1)

2. Hayleymeyer

For two points at (x1,y1) and (x2,y2), respectively, the rate of change is equal to the slope of the shortest possible line segment connecting the two points. This slope can be calculated by the following equation: m = (y2-y1)/(x2-x1)

3. bry856

i dont have enough numbers though to use that equation

4. bry856

this is what it looks like

5. Hayleymeyer

ohh! idk how to do that part! sowwiee <3

6. anonymous

you do have enough points to use that equation. [-4, -2] is an interval, not a point. They're saying find the slope between the points where x = -4 and x = -2. What is the y-value when x = -4, and what is it for x = -2?

7. bry856

y= -12 when x= -4, and y= 0 when x= -2

8. anonymous

ok. so the points are (-4, -12) and (-2, 0). $ROC=\frac{ y _{2}-y _{1} }{ x _{2} -x _{1}}=\frac{ 0-(-12) }{ -2-(-4) }$

9. bry856

and that equals 6 right

10. bry856

i cant get an equal answer when i try to do (-2,1)

11. anonymous

yes it's 6. Can you show me what you did for [-2, 1]?

12. bry856

ohhh i accidentally put exponents , i now got 1

13. bry856

|dw:1433864867540:dw|

14. bry856

thank you

15. anonymous

yes that's right. You're welcome