## anonymous one year ago Select the equation of a line that is perpendicular to the line on the graph and passes through the point (-1, 2)

1. anonymous

The graph has 2 points Point A: (-2, 0) Point B: (0, -1)

2. anonymous

point a because perpendicular means the opposite so therefore the opposite of the y axis will be -2

3. anonymous

Y=2x+4 Y=-2x+4 Y=-1/2x+2 Y=2x-1

4. anonymous

@denishays111

5. Nnesha

first you need to find slope of two points (-2,0)(0,-1) formula to find slope is $\huge\rm \frac{ y_2 -y_1}{ x_2 -x_1 }$ plug in y and x values

6. anonymous

(-1)-0= 0-(-2)

7. anonymous

So -1/2

8. Nnesha

yep right :=) now perpendicular slope is negative reciprocal for example if slope of first equation is - a/b then slope of perpendicular equation would be positive b/a

9. Nnesha

so what is the slope of 2nd equation ?

10. anonymous

-2x?

11. anonymous

Sorry 2x

12. Nnesha

yep right

13. anonymous

So would the answer be y=2x+4

14. Nnesha

so equation of slope intercept form is y =mx+b where m is slope so substitute m for 2 and pick on of order pair to plug in value of x and y solve for b

15. Nnesha

so how did you get A ? and how do you know it's not D ?

16. anonymous

Because when i look at the line The y intercept must pass through (-1, 2)

17. anonymous

So i thought the line would be slanted the other way

18. anonymous

So its d?

19. Nnesha

perpendicular line passes through the point (-1,2) so substitute x and y for (-1,2)

20. Nnesha

nope first one is correct i just wanted to know how did YOU get A :=)

21. anonymous

Ok, thank you very much

22. Nnesha

my pleasure :=)