So basically your doing unit rates? Well guess what, I'm studying about that also, and I have a little understanding about unit rates, have you done ratios before?
No she can't spend $4.39 for each sandwich because if you divide 20 by 5 your quotient will be 4.
divide both sides by a
subtract b from both sides
multiply all terms on both sides by -1
c=b-d/a
It is x=-3 just use Photomath bro
