William raced up a flight of stairs at the rate of 3 stairs per second. The function below shows the total number of stairs f(t) that he is able to climb in t seconds:
f(t) = 3t + 4
Which statement best describes the y-intercept of the graph of the function?
It is equal to 7 and represents the number of stairs William can climb in 1 second.
It is equal to 3 and represents the number of stairs William can climb in 1 second.
It is equal to 4 and represents the number of stairs William had already climbed before he started racing up.

Question

William raced up a flight of stairs at the rate of 3 stairs per second. The function below shows the total number of stairs f(t) that he is able to climb in t seconds:
f(t) = 3t + 4
Which statement best describes the y-intercept of the graph of the function? 
It is equal to 7 and represents the number of stairs William can climb in 1 second. 
It is equal to 3 and represents the number of stairs William can climb in 1 second. 
It is equal to 4 and represents the number of stairs William had already climbed before he started racing up.

anonymous · Answer

It is equal to 3 and represents the number of stairs William had already climbed before he started racing up.

anonymous · Answer

I think you mixed 3 and 4 with the response you gave. Why do you think that is the correct answer?

anonymous · Answer

oh that was the last choice that didn't fit on the first question

anonymous · Answer

so is it C? because that's what i think. i just want to see another opinion

love_to_love_you · Answer

I think it is c too.

love_to_love_you · Answer

It's because this equation is in y=mx+b form and b=y-intercept, in this case, it is 4.