determine the domain and range for each relation graphed below. then, state whether or not the relation is a function. if it is not a function, state how you know

Can someone explain the elimination method to me for this problem?

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

Use the expression below.–4b + 8c + 12 – 8b – 2c + 6part asimplify the expression. enter your answers in the boxes. b + c + part bfactor the simplified expression using the gcf. a. 2(–2b + c + 3) b. 3(–2b + c + 3) c. 4(–2b + c + 3) d. 6(–2b + c + 3)part cwhat is the value of the expression when b = 2 and c = –3? enter your answer in the box.