Question

http://prntscr.com/8dsrfw how do you graph this?

Answer 1

plug in some numbers and fractions
find pattern and finish graph

Answer 2

I'm assuming this is a floor function?
or "greatest integer function"?

Answer 3

if so,
then
f(1) = 4(1) + 5 = 9
f(1.5) = 4(1.5) + 5 = 4(1) + 5 = 9
f(2) = 4(2) + 5 = 13
f(2.3) = 4(2.3) + 5 = 4(2) + 5 = 13
so we can get