4. Which relation below does not define a function? A.X у B. у C. X x A 1 A 5 B 2 B C 3 C 1 5. The function f(x) = 5x + 8 can be also expressed as Which variable is dependent? A. x and y B. y-variable X-va C. 6. What is the domain of the relation shown in figure 2?​