Question

What is the answer of 7th question

Answer 1

Answer:

mary = 42 years old

daughter = 12 years old

Step-by-step explanation:

let daughters age be y and marys age by x

x - 7 = 7(y - 7)

x - 7 = 7y - 49

x - 7y = - 42

x + 3 = 3(y + 3)

x + 3 = 3y + 9

x - 3y = 6

- 4y = -48

y = 12

x = 42

Answer 2

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