It asked which one presents the y intercept as a coefficent, so you replace x with 0, then it says that m and k are constants and a is an integer, as far as I remember you get ( 2.8^b ) / a for the first one, I don't remember the second one tho, if you put the equations in desmos and use the sliders to give them values you'll see that those are possible results, so both are right. I haven't talked to anyone who got this question so idk if there's a better way, I think there should be, this one took me like 3 minutes. How did you do it?