Asked by Johannes

Y varies partly as x, partly inversely as x and partly constant. The graph of y against x passes through the points (2,20), (3,16), and (5,14). Find a general formula for y in terms of x

My proposed formula is

y = x / kx
Answered by Steve
Your equation just satisfies y varies directly as x. What about the rest?

y = ax + b/x + c

Now use the points to get 3 equations in a,b,c and solve them.