The average lifespan of a tiger is 17 years. this is 3 years less than the average lifespan of a lion. write and solve an equation to find the average lifespan of a lion.

x=y-3

20 years

Step-by-step explanation:

So lets make some variables to equate them, let x be the lifespan of the tiger and y be the lifespan of a lion. Since the lifespan of a tiger if 3 years less then a lifespan of a lion , lets subtract the 3 year difference from the lifespan of a lion.

x=y-3

Lets input the known lifespan of a tiger.

17=y-3

Add 3 to both sides to get our variable on its own.

17+3=y-3+3

do the addition

20=y

The lifespan of a lion is 20 years.

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step-by-step explanation: