represents the amount of money Sonia earns by working for hours.
tells us how many loaves Sonia can bake in hours. So, for example, if she works for 10 hours, she can bake loaves of bread.
tells us how much money she earns for the number of loaves sold. So, for example, if Sonia bakes 10 loaves of bread, then she earns (insert units of money).
The composite function is really a function of time, not number of loaves. So if Sonia works for 10 hours, then she makes about 44 loaves of bread, and so would earn about .
You first subtract the 4x to the right side, then you have your answer. This equational term is called Point-Slope Form. The answer is "y=-4x+5" or "Y=5-4x"