What does #f(x)=y# mean? Algebra Expressions, Equations, and Functions Function Notation 1 Answer Wataru Nov 11, 2014 It means that the function #f# takes #x# as an input and spits out #y# as an output. I hope that this was helpful. Answer link Related questions How do you find the output of the function #y=3x-8# if the input is -2? How do you write the total cost of oranges in function notation, if each orange cost $3? How do you rewrite #s=2t+6# in function notation? How do you find the value of #f(-9)# for #f(x)=x^2+2#? What does a dependent and independent variable mean? What is the difference between an equation written in function notation and one that is not? How do you evaluate function notation? What is Function Notation? How do you write equations in function notation? If #f(x)=4x^3-4x^2+10# then how do you find #f(-2)#? See all questions in Function Notation Impact of this question 16069 views around the world You can reuse this answer Creative Commons License