We want to write an equation that represents the given sentence, the equation is:
y - 9 = 8
So we have the sentence:
"A number y decreased by 9 is 8"
So we start with a number y, and then we decrease it by 9, this is:
y - 9
And that must be equal to 8, so the equation is just:
y - 9 = 8
This is the equation we wanted to get.
If you want to learn more about algebra, you can read:
https://brainly.com/question/7784687
