If y = -30 when x = 15, what is the value of x when y = 60?

If y = -30 when x = 15

then x = 60 when y = 60

the solution is h=10 because you add 9 to each side of the equation.

the domain of a function is the set of input values, x , for which a function is defined. the domain is shown in the left oval in the picture below. the function provides an output value, f(x) , for each member of the domain.