Waiting room

In the waiting room are people and flies. Together they have 21 heads and 102 legs (fly has 6 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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