y = mx + b. Use this equation for most linear functions. Enter the information that is given to you.
[tex] - 6 = - 3(4) + b[/tex]
Multiply the -3 and 4 to get 12.
[tex] -6 = - 12 + b[/tex]
Now divide the -12 from both sides.
[tex] \frac{ - 6}{ - 12} = \frac{ - 12}{ - 12} + b[/tex]
-12 cancels out on the right side and your left with
[tex] - \frac {1}{2} = b[/tex]
Now re-enter the info back into the formula.
[tex]y = - 3x - \frac{1}{2} [/tex]
Then you've got your formula
