Question

I need the correct equition of this line
(0,-1), (2,-5), (4, -9)

Answer 1

Find, find the slope.


\(\Large \color{MidnightBlue}{\Rightarrow {-5 - (-1) \over 2} }\)

\(\Large \color{MidnightBlue}{\Rightarrow -2 }\)

Now, we know that it is

y = -2x + b

Let's find the y-intercept now.

\(\Large \color{MidnightBlue}{\Rightarrow -5 = -2(2) + b }\)
\(\Large \color{MidnightBlue}{\Rightarrow -5 = -4 + b }\)
\(\Large \color{MidnightBlue}{\Rightarrow -1 = b }\)

So, the equation is:

\(\Huge y = -2x - 1\)

Answer 2

Please see my tutorial for more questions.
http://openstudy.com/study#/updates/4fb9f5a9e4b05565342ee28c