## anonymous one year ago The lines below are perpendicular. If the slope of the green line is -8, what is slope of the red line? http://media.apexlearning.com/Images/200706/18/c817aaf3-1699-431d-b875-0f827d8526bc.gif m=

1. butterflydreamer

if the lines are perpendicular, it means that when you multiply the slope of line 1 and slope of line 2, it will equal to -1. $m_{1} \times m _{2} = -1$

2. anonymous

so the answer is -1 ?

3. anonymous

@UsukiDoll do you know ?

4. butterflydreamer

not quite

5. anonymous

okay so what do you do after ?

6. UsukiDoll

If we had two parallel lines with a slope of -8 then the slope will still be the same. But this time we're given two perpendicular lines so at one point, two lines will intersect.

7. butterflydreamer

|dw:1436357240762:dw|

8. UsukiDoll

you have to get the reciprocal of -8 and that's what happened ^

9. anonymous

1/8 ?

10. UsukiDoll

yes

11. anonymous

12. UsukiDoll

yup

13. anonymous

alright thanks to both of yall

14. butterflydreamer

no problemo~