A number y decreased by 9 is 8.

An equation that represents this sentence is

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.

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y - 9 = 8

y = 17

Step-by-step explanation: