Question

To buy concert tickets there is a service charge and a cost per ticket. Write an equation to show the cost for any number of tickets. x y Number of Tickets Cost in Dollars 1 22 2 40 3 58 4 76 A. y = 22x B. y = 18x + 4 C. y = 18x D. y = 4x + 18

Answer 1

Given table:

X | Y
-------
1 | 22
2 | 40
3 | 58
4 | 76

As easy way to find out which of the equations in the choices is correct, is to plug in the different values of x, and see which equation gives out the corresponding values of y. Let us try this below:

A. y = 22x

22(1) = 22 || OK
22(2) = 44 || WRONG

B. y = 18x + 4

18(1) + 4 = 22 || OK
18(2) + 4 = 40 || OK
18(3) + 4 = 58 || OK
18(4) + 4 = 76 || OK

Therefore, the correct answer is B.