## anonymous one year ago What is the equation of a vertical line passing through the point (3, −5)? A. y=-5 B. x=-5 C. y=3 D. x=3

1. triciaal

|dw:1438572480910:dw|

2. anonymous

y=-5?

3. triciaal

which axis is vertical? the line through the point is parallel to the vertical axis

4. anonymous

vertical would be up and down therefore making it y=-5? correct

5. anonymous

?

6. triciaal

vertical is up and down correct not y =

7. triciaal

|dw:1438572752351:dw|

8. anonymous

i dont get how it would be x when the x axis is horizontal

9. jim_thompson5910

@caishaax3 consider what points lie on this vertical line. What do all of these points have in common?

10. anonymous

hmmmm, i wanna say they fall on the x axis but i feel like im wrong

11. jim_thompson5910

we're given (3,-5) what's another point that lies on the vertical line?

12. anonymous

-3

13. jim_thompson5910

look at points directly above or below (3,-5)

14. jim_thompson5910

for instance, (3,2) lies directly above the given point |dw:1438573088091:dw|

15. jim_thompson5910

making sense?

16. anonymous

ok, do i plug that into a formula? to find my answer

17. jim_thompson5910

do you see how I got (3,2) ?

18. anonymous

you went over three up two

19. jim_thompson5910

yes

20. jim_thompson5910

and notice how it's directly above (3,-5)

21. jim_thompson5910

what is another point on this vertical line?

22. anonymous

(3, -1)

23. jim_thompson5910

good |dw:1438573350010:dw|

24. jim_thompson5910

how about one more point what's another point on this vertical line?

25. anonymous

(3, 4)

26. jim_thompson5910

|dw:1438573401061:dw|

27. jim_thompson5910

notice how all of the points plotted, and any other point we didn't get to, all have the same thing in common: they have an x coordinate of 3

28. jim_thompson5910

|dw:1438573439286:dw|

29. anonymous

so x=3

30. jim_thompson5910

yes. this vertical line is the equation x = 3 EVERY point on this line has an x coordinate of 3. The y coordinate doesn't matter

31. anonymous

thank you so much

32. jim_thompson5910

no problem