Step-by-step explanation:
Using the vertical line test, we can see which lines are functions, and which are not. If a vertical line were to hypothetically appear, would it touch more than one part of the line? If so, it is not a function.
The lines outlined in a black box are the correct answers.
The y-intercept of the function is $50 and it represents the fixed amount for the labor charges.
<h3>How to find the y-intercept of a graph?</h3>
From the attached graph, we see that the x-axis is represented by time in hours while the y-axis is represented by labor charges in dollars.
Now, from the graph we see that the coordinates are;
(0, 50), (1, 125), (2, 200), (3, 275), (4, 350)
Now, the y-intercept of a linear graph is simply the point at which the graph crosses the y-axis.
In this graph attached, we see that the y-intercept is at the coordinate (0, (0, 50).
Thus, we conclude that the y-intercept of the function is $50 and it represents the fixed amount for the labour charges.
Read more about y-intercept at; brainly.com/question/26509774
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