li allsweld as attachments. 1. Suppose f is a linear function: f (x) = ax + b where a and b are constants. (a) Given that f(0) = -3 and f(3) = 1, find the values of a and b. (b) What is the rate of change of f? (c) Sketch the graph of f. (label the scale on the coordinate axes and make sure that your graph is accurate)