Here is another question that is from CJC H2 Mathematics 9758 Prelim Paper 1. Its a question on differentiation. I think it is simple enough and tests student on their thinking comprehension skills. This is question 6.
A straight line passes through the point with coordinates (4, 3) cuts the positive x-axis at point P and positive y-axis at point Q. It is given that 
, where 
and O is the origin.
(i) Show that equation of line PQ is given by 
.
(ii) By finding an expression for 
, show that as 
varies, the stationary value of is 
, where 
and 
are constants to be determined.
