almost. you will have 3 = 9-21 + C

note that you have the points (1,1) and (-2,-8) on the line. you can use these to find the slope of the line (do you know how?), once you have that, you can find the equation of the line, which is the rule you are looking for. it will be of the form y = mx + b, where m is the slope, and b is the y-interceptAlso

- for the linear function
f. It is known thatf(1)=1 andf(-2)=-8. Find the function rule.

I am a little stuck with this one and unsure how to approach it??