I really need help with this, I will medal :D
A line has a slope of 3 and contains the point (−1, −8).
Which equations represent the line?

A. −3x + y = −5
B. 3x + y = −5
C. (y – 8) = 3(x − 1)
D. (y + 8) = 3(x + 1)

Question

I really need help with this, I will medal :D
A line has a slope of 3 and contains the point (−1, −8).
Which equations represent the line?

A. −3x + y = −5
B. 3x + y = −5
C. (y – 8) = 3(x − 1)
D. (y + 8) = 3(x + 1)

anonymous · Answer

I think its A and D

welshfella · Answer

the point slope form of a line is

y - y1 = m(x - x1)   where m = slope and (x1,y1)  is a point on the line

plug in the given values to get your equation

anonymous · Answer

so its A and D....?

welshfella · Answer

m = 3 , x1 = -1 and y1 = -8

welshfella · Answer

plugging them in gives option D  Yes

anonymous · Answer

ok, so what about option a?

welshfella · Answer

now you need to rearrange equation D and see if you get one of the other options

welshfella · Answer

y + 8 =  3(x +1)
y + 8 = 3x + 3

can you continue?

anonymous · Answer

I still get option a...

anonymous · Answer

:( I think its A and D...

welshfella · Answer

yes you are correct

anonymous · Answer

thanks....can you help with another? or are you busy...? XD I will still medal you though

welshfella · Answer

y + 8 = 3x + 3
subtract 3x from both sides
-3x + y + 8 = 3
subtrcat 8 from both sides
-3x + y = -5

anonymous · Answer

Which graph is the line y=-(1/5x)-1 ?

welshfella · Answer

no i have about 15 minutes but please re post

welshfella · Answer

oh ok carry on

anonymous · Answer

ok, thanks for the help, I will tag you