If there's a total of 20 students and 40% love the museum. 20 * .40 = 8 students love the museum.
Let's Simplify X to equal 1 by dividing by 100. then we divide 420 by 100 to get 4.2, so y=4.2 when x=1, we then multiply by each by 11.
y = 46.2
x = 11
The answer would look something like this:

There could also have a simplified version.
I hope this helps.