Sarah's receives a base salary of $4,000 each month. In addition, she earns a commission of $50 for each unit of product she sells. If x represents the number of units sold in a month, which linear function models Sarah's total monthly salary?
Answer
A
y is equal to 50 x plus 4 comma 000
B
y is equal to 4 comma 000 plus 50
C
y is equal to 4 comma 000 x plus 50
D
y is equal to 4 comma 000 minus 50 x
Explanation
Sarah’s total monthly salary is her $4,000 base salary plus $50 for each unit sold. For x units, the commission is 50x, so the total is y = 4,000 + 50x. This matches choice A, “y is equal to 50x plus 4,000.”
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