What is the maximum of the sinusoidal function?

Maximum is 5
when you graph a function on the coordinate place, the x-coordinates represents the input while the y-coordinates represent the output of the function, or the function value.
the highest possible value of a sinusoidal  function is the maximum
the maximum is 5 because that is the highest value of the sinusoidal function. it is the highest y-value the function can attain.

The answer is: y would equal 3 because if you simplify the equation then it would be y= 3x+9 and if you divide 3x and 9 by 3 it would equal 3. y= 3