Use the point slope formula to write an equation of the line given the following.

The line passes thru the point (4,-1) and is parallel to the line y=3x+1?

Question

Use the point slope formula to write an equation of the line given the following.

The line passes thru the point (4,-1) and is parallel to the line y=3x+1?

anonymous · Answer

point slope formula:
$$(y+b) =m(x+a)$$
where "a" and "b" is your (4,-1) aka (a,b), remember to take the negatives into mind. 

your slope is the "m" which is the "3" from your original equation which will be the same in your new equation since they are "parallel"

your new equation should look similar to this but is not the answer!

$$y = 3x + 6$$

anonymous · Answer

Alright what I have is

y-(-1)=3(x-4)
y+2=3x-12

and ended with y=3x-13

anonymous · Answer

Your last constant "13" is a bit incorrect. Remember to subtract the right amount. Otherwise, good job. Sorry for the mistaken sign of "+" and "-" in the first equation. 

Cheers.

anonymous · Answer

but wouldn't y-(-1) turn it to y+1?   o.o

anonymous · Answer

you put y+2 as your second output after the first. But you are right y-(-1) is y+1. Lol. The confusion was in your 2nd reply with the "y+2". Sorry, I'm going a bit fast and seem to have not caught the other mistake before realizing the final answer is correct. 

=)

anonymous · Answer

Oh good lord I didn't see that I had written 2. So, it ends up being y=3x-13? Is that all I have to do?

anonymous · Answer

Yes. That's all you have to do. =)

anonymous · Answer

Gracias