Question

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19. Lennon bought two books for $21.00. One book
cost $8.00. Solve the equation 21 = b + 8 to find
b, the cost of the other book.

Answer 1

Answer: 13

Explanation:

He bought two books for $21, and one of the books was $8. With this, we know that if we subtract 8 from 21, we can get "b", or the cost of the other book

21 = b + 8

-8 -8

13 = b

b = 13

Therefore, b = 13, or $13 for the other obok

Answer 2

b = 13

Explanation:

21 = b + 8 Subtract 8 from both sides

21 - 8 = b + 8 - 8

13 = b