A-2: Project D.
b: Project A.
Not sure about a-1, hope I helped.
Multiply both variables individually by the multiplied variable (x)... and you find yourself with -fx + hx.... Remember to bring that negative integer along too or the answere that I have without a negative integer won't count... I hope this clarified your understanding and question. As always good spiruts
The answer is b because each x value has one y value.