Question

Use the equation y = 20k + 15 to find the cost of the party when the number of guests is 5. Write your answer as an ordered pair.

a) (5, 115)
b) (5, 105)
c) (5, 125)
d) (5, 100)

Answer 1

By substituting the number of guests, which is 5, into the equation y = 20k + 15, we calculate the total cost of the party to be 115, leading to the ordered pair (5, 115).

Step-by-step explanation:

To find the cost of the party when the number of guests is 5, we substitute the value of 5 for k in the equation y = 20k + 15.

So, if k = 5, then:

y = 20(5) + 15

y = 100 + 15

y = 115

The ordered pair representing the number of guests and the total cost of the party is (5, 115). Therefore, the answer is option a) (5, 115).