Answer this question please and thank you

Will give brainliest summations with algebraic expressions image shown

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

Which of the following best describes the graph below? + + 2 + 3 + 4 1 o a. it is not a function. o b. it is a one-to-one function. o c. it is a many-to-one function. o d. it is a function, but it is not one-to-one.