Please help please add the number of the question and then the answer.

It's B. for the first question, the top answer for the second question, everything except for the vertical line is a function. ( | ) < vertical. A is the answer for #4. For #5, it is (-1, 0)

When finding a function, a x-value can't have 2 different y-values. But y-values can have multiple different x-values. Like a vending machine. There is A-1, A-2, A-3, B-1, B-2, B-3. X value will be the letters while the y value is the numbers. There is 2 of the same numbers (y-value) like A-1, and B-1, they both contain 1, but you don't see two with the same letters and numbers. Like A-1 and A-1, there is only one A-1, not two. Hopefully this makes sense.

this is not the answer this is just a question. is this middle school math?

step-by-step explanation:

sine

step-by-step explanation: