Question 18
**(c)** $3y - xy + 15 - 5x = 18$
where $x$ and $y$ are positive integers.
Using your answers to **part (a)** and **part (b)**, find one possible value of $x$ and the corresponding value of $y$.
(In part (a) you found that the factors of 18 are 1, 2, 3, 6, 9, 18. In part (b) you found $3y - xy + 15 - 5x = (y + 5)(3 - x)$.)
where $x$ and $y$ are positive integers.
Using your answers to **part (a)** and **part (b)**, find one possible value of $x$ and the corresponding value of $y$.
(In part (a) you found that the factors of 18 are 1, 2, 3, 6, 9, 18. In part (b) you found $3y - xy + 15 - 5x = (y + 5)(3 - x)$.)
