## anonymous one year ago Can some one help me answering these four questions?? I think I have the correct answer for the last two but im not really sure 1. how do you find the distance between two points on the coordinate plane? 2. how do you find the slope between 2 points on the coordinate plane? 3. what do you have to see as evidence to be convinced that the 2 lines are parallel? 4. what do you have to see as evidence to be convinced that 2 lines are perpendicular?

1. Mehek14

2. anonymous

Never mind I dont have the last two...I ended up loosing my answers..

3. Mehek14

Parallel lines You know they're parallel when they never intersect |dw:1436894589815:dw|

4. Mehek14

Perpendicular the lines intersect at a 90 degree angle |dw:1436894638111:dw|

5. Mehek14

does that help for the last 2?

6. anonymous

Yeah but the first two im really struggling on

7. Mehek14

finding the distance on a coordinate plane: distance formula

8. anonymous

or you could say the slope for parallel lines are exactly the same and for perpendicular the slopes are exact opposites

9. Mehek14

@Chumpian perpendicular lines have to intersect at 90 degrees

10. anonymous

yes i know that lol

11. Mehek14

2) $$\dfrac{rise}{run}$$

12. anonymous

Ok thank you that helps me alot

13. anonymous

Could you explain the distance formula really quick to me though?

14. Mehek14

sure $$\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$$

15. Mehek14

if you have these ordered pairs (10,0) and (5,4) $$y_2=4\\y_1=0\\x_2=5\\x_1=10$$

16. Mehek14

$$\sqrt{(4-0)^2+(5-10)^2}\\ \sqrt{4^2+(-5)^2}\\ \sqrt{16 + 25} \\ \sqrt{ 41} = 6.4$$

17. Mehek14

^ that's how you do it

18. anonymous

Thank you again

19. Mehek14

yw