Algebra 1--Please, help me!

4. The sum of the digits of a two-digit number is 11. If 45 is added to the number, the digits will be reversed.

a. Write a system of equations that you can use to find the digits of the number. Tell what each variable represents.
b. Solve the system of equations to find the two-digit number. Show your work.

A:

a. ?
b. ?

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