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
