Choices:
A. Table 1
B. Table 2
C. Table 3
D. None of the above
Correct Answer: A
Solution:
Step 1: The commission earned by Brad on each vacuum cleaner
he sells = $4.
Step 2: The amount earned by Brad (a) = 4 x number of vacuum cleaners he sells (n).
Step 3: a = 4n [Original equation.]
Step 4: a = 4(0) = 0 [Substitute 0 for n and simplify.]
Step 5: a = 4(3) = 12 [Substitute 3 for n and simplify.]
Step 6: a = 4(5) = 20 [Substitute 5 for n and simplify.]
Step 7: a = 4(7) = 28 [Substitute 7 for n and simplify.]
Step 8: a = 4(10) = 40 [Substitute 10 for n and simplify.]
Step 9: a = 4(12) = 48 [Substitute 12 for n and simplify.]
Step 10: Among the choices, Table 1 satisfies the equation.
Step 11: The graph below represents the function a = 4n.