If $$a$$ and b are positive integers such that $$a + b = 9$$, then
what is the value of $$\dfrac{b-9}{4a} $$

Question

If $$a$$ and b are positive integers such that $$a + b = 9$$, then
what is the value of $$\dfrac{b-9}{4a}  $$

Uniteasy Admin · Accepted Answer

Since $$a + b = 9$$
$$b-9 = -a$$
$$\dfrac{b-9}{4a}  =\dfrac{-a}{4a}  =-\dfrac{1}{4}  $$
Therefore
C is correct