Question

How do you write a variable expression for the word phrase "a number decreased by 8"?

Answer 1

`y=x-8`

Explanation:

When you say a number decreased by eight, then it means that there are 2 defined numbers, and the difference between the 2 numbers is eight.
So there's some defined `y` and a defined `x` such that `y-x=8` so that means `y=x-8`