## Agl202 one year ago Quick Question... MEDAL!!! What is the equation in point-slope form of the line passing through (4, 0) and (2, 6)? y = 4x − 2 y = 2x − 4 y = −3(x − 4) y = 3(x + 4)

1. Agl202

What is the equation of a horizontal line passing through the point (−3, 8)? x = −3 y = 8 x = 5 y = −11

2. Agl202

For the second one I think it's A. Right?

3. Agl202

The first one is D.

4. MrNood

no - not 'right' it's a horizontal line what is true about the y value for all points on a horizontal line?

5. MrNood

|dw:1442266108704:dw| for the first one - the answer is not D

6. Agl202

Hmmm

7. MrNood

for the fist one: you have 2 points (as I sketched above) the slope is calaculated by subtracting the the y values , subtracting the x values and dividing what is the slope of the line in the first one? in the second one: it's a horizontal line what is true about the y value for all points on a horizontal line?

8. Agl202

For the second one: all values of x give the same value of y .

9. Agl202

y=8 right?

10. MrNood

ok good so y is a constant the point (-3, 8) has what y value? (it lies on the line so all points have the same y value)

11. MrNood

12. Agl202

:D Thx... for the first one: the slope is 1

13. MrNood

$slope = \frac{ y _{2} - y _{1}}{ x _{2}- x _{1} }$ the slope is not 1

14. Agl202

-1

15. MrNood

no use the equation above

16. MrNood

|dw:1442266895084:dw| |dw:1442266952357:dw|

17. MrNood

use the above to write down y2-y1 = ? x2-x1= ?

18. zpupster

4.0 not 0,4

19. MrNood

sorry - yes - my drawing is correct but the table is wrong

20. MrNood

|dw:1442267369262:dw|

21. zpupster

6-0/2-4

22. MrNood

@zpupster this is for @Agl202 please let hinm answer @agl - I am outta here soon - are you going to answer?

23. MrNood

since you don't know haw to calculate slope - HOW do you know that is correct?