28. There are 8 oranges in a bowl. Write a rule for the number y of oranges

that are left in the bowl as a function of the number x of oranges that are

taken from the bowl.

The rule is y = 8 - x

Step-by-step explanation:

* Lets explain how to solve the problem

- There are 8 oranges in a bowl

- The variable y represents the number of oranges that are left

in the bowl

- The variable x represents the number of oranges that are taken

from the bowl

- To make the rule for these situation we must to write two sides equal

each other

∵ The total number of oranges is 8

∵ The number of oranges that are taken from the bowl is x

∵ The number of oranges that are left in the bowl is y

- We can find the number of oranges that are left by subtracting the

number of oranges that are taken from the total number of oranges

∴ y = 8 - x ⇒ OR ⇒ y = - x + 8

* The rule for the number y of oranges that are left in the bowl as a

function of the number x of oranges that are taken from the bowl

is y = 8 - x