Waiting room

In the waiting room are people and flies. Together they have 21 heads and 102 legs (fly has six legs). How many people and flies are in the waiting room?

Correct answer:

x =  6
y =  15

Step-by-step explanation:

x+y=21 2x+6y=102  x+y=21 2 x+6 y=102  x+y=21 2x+6y=102  Pivot:Row1Row2 2x+6y=102 x+y=21  Row221 Row1Row2 2x+6y=102 2y=30  y=230=15 x=21026y=21026 15=6  x=6 y=15

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