Question

EASY ALGEBRA 1 QUESTION--> PLEASE BE QUICK FOR EXPLINATIONS, THX!!! :D

The table below shows the outputs, y, for different inputs, x:

Input (x) : 1 1 3 3
Output (y) : 4 2 12 6

PART A: Does the table represent y as a function of x? Justify your answer.

PART B: The total cost f(x), in dollars, for renting a paddle boat for x hours is shown below:
f(x) = 20 + 10x
What is the value of f(120), and what does f(120) represent?

Answer 1

no, it failed the vertical line test

Answer 2

Part A)
The table doesn't represent y as a function of x.
Why? One reason is that 1 or 3 is the first element in more than one ordered pair.
Part B)
f(x) = 10x + 20
f(120)= 10*120 + 20 = 1200 + 20 = 1220
f(120) represents cost of boating for 120 hours.

Answer 3

I wasn't very sure of what part a was asking me. I do know that a function can't have a repeating domain, though. Thx for clarifying that one, but how should I justify my answer?

Answer 4

Given a value of x, there cannot be more than one value of y that correspond to x

Answer 5

Yes