SOLUTION: Peter is x years old and his sister is5 years older. If the product of their age is 84 form an equation in x and solve it to find Petr's age. I would really appriciate it if y

Question 13458: Peter is x years old and his sister is5 years older. If the product of their age is 84 form an equation in x and solve it to find Petr's age.

I would really appriciate it if you would assit me in this Thanks.
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Peter's age = x.
His sister's age = x+5

Subtract 84 from both sides.
Solve for x by factoring.

Discard, as ages can't be negative.
Peter's age is 7 years old and his sister is 12 years old.
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