Function or Not a Function

Label:

Explanation:

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Step-by-step explanation:

Label: Not a function

Explanation: if you look at the x column, I there are two 1s with each one having a different Number in the F(x) column. Also there are two gives each one having a different Number in the F(x) column. Since these numbers aren't the same they are NOT functions.

a + c = 150

7.75a + 10.25b = 1470

Step-by-step explanation:

Let a represent the number of adult tickets that were sold.

Let c represent the number of child tickets that were sold.

The celluloid cinema sold 150 tickets to a movie. Some of these were child tickets and the rest were adult tickets. This means that

a + c = 150 - - - - - - - - - - - - - -1

A child ticket cost $7.75 and an adult ticket cost $10.25. If the cinema sold $1470 worth of tickets, it means that

7.75a + 10.25b = 1470 - - - - - - - - -2