Question

Determining Ordered Pairs

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

Answer 1

• C) (1, 30) and E) (3, 90)

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Piano lessons cost $30 per lesson.

This can be expressed as function:

• C(l) = 30l, where C- total cost, l - number of lessons

Evaluate the given ordered pairs:

• A) (-1, - 30) - not applicable as number of lessons can't be negative,
• B) (0, 30) - incorrect as C(0) = 30*0 = 0, it should be (0, 0);
• C) (1, 30) - correct as C(1) = 30*1 = 30;
• D) (1.5, 50) - incorrect as C(1.5) = 30*1.5 = 45;
• E) (3, 90) - correct as C(3) = 30*3 = 90.