Question

Carlos is five years older than twice his sister's age. Carlos is 13.

Which equation and solution correctly identifies his sister's age?

Answer 1

answer choices (please post these next time)

2x - 5 = 13; x = 9
2x + 5 = 13; x = 4
2x - 5 = 13; x = 4
2x + 5 = 13; x = 9

Answer 2

that being said:

the equation uses x as the unknown. in this case, since we don't know his sister's age,
x = the unknown = his sister's age

now, onto the problem: ---> Carlos is five years older than twice his sister's age.

"twice his sister's age" ---> multiply x by 2
"five years older than twice his sister's age" ---> take the previous response, and add 5 to get your complete equation

to find x, simply solve the equation