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Lisa and Daisy work at a hair salon. The salon charges $18 for a hair styling session with Lisa and $12 for a session with Daisy. The income on a certain day is projected to be $216. This situation can be represented by the equation 18x + 12y = 216, where x is the number of Lisa's customers and y is the number of Daisy's customers. How many customers would Lisa need to serve to attain the projected income if Daisy calls in sick that day? (Note: x ≥ 0, y ≥ 0, and x and y take only integer values.)

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Nirina7
the answer:
The income on a certain day is projected to be $216.
 since we have the equation 18x + 12y = 216 as equation, so the solution depends on it.
Daisy calls in sick that day does mean y = 0,
so  18x + 12 (0) = 216 implies  18x= 216 so x= 216 / 18 = 12
Lisa need to serve 12 customers to attain the projected income.

proof:  12 x 18 = 216

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