Question

The table below is a function which shows the amount of money remaining on a gift card each week after the gift was given.

What is the value of the x-intercept for this function?
How do you know?

Answer 1

Week (x) = 5

Explanation:

You want the x-intercept of the function shown in the table.

X-intercept

An x-intercept of a function is a point on the graph where the function value is zero.

Here, the "Amount" is zero when "Week" is 5.

The x-intercept is 5.

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Additional comment

Usually, the "x" value of a function is listed on the first line, or in the first column, of a table. Also, when time is involved, time is usually represented on the horizontal (x) axis. This suggests that "Week" is the label for the horizontal (x) axis, and "Amount" is the label for the vertical (y) axis of a graph of this relation.

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