The function f takes number of years since 2000 and gives number of cows on a farm, g takes number of cows on a farm and gives tons of feed the farm needs in
a year. Combine these so that C takes number of years since 2000 and gives
tons of feed the farm needs in a year.

You need to make Y by itself without the 3, so you divide everything by 3 so Y can be it’s on variable, then you’ll move the 2/3x over the equal sign, so now your equation should look like y= -2/3x + 7. Your slope is -2/3, and it’s negative because it moved over the = sign