Question

piano lessons cost $30 per lesson. Find ordered pairs that represent the total cost for x number of lessons. Check all that apply. (–1,–30) (0,30) (1,30) (1.5,50) (3,90)

Answer 1

The cost of each Piano Lesson = $30
If there are x lessons, the total cost of lessons can be expressed as 30x.

Since the number of lessons cannot be negative, the value of x can be 0 or greater than 0, where x=0 shows no lesson.

For 1 lesson, x = 1
So the cost will be = 30(1) = $30
In ordered pair we can write it as (1, 30)

If we consider there is an option to attend half portion of a lecture, then for 1 and half lectures, x = 1.5
So, the cost for 1.5 lectures will be = 30(1.5) = $45
In ordered pair we can write it as (1.5, 45)

For 3 lesson, x = 3
The cost of 3 lessons will be = $90
In ordered pair we can write this as (3, 90)

So, from the given options, only following 2 ordered pairs satisfy the given conditions:
1) (1,30)
2) (3, 90)