11-05-2022
Mathematics

contestada

Mary is 21 years old. Her age is 9 years more than 3 times Henry's age. Which equation can be used to determine x, Henry's age in years?

9 +21= 3x

x + 9 = 21

21+x=3(9)

3x + 9 = 21

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11-05-2022

Answer:

3x + 9 = 21

Step-by-step explanation:

Let Henry's age be x

Mary's age = 9 + 3x

21 = 9 + 3x

Can also be written as 3x + 9 = 21

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