Math CentralQuandaries & Queries


Subject: linear equations
Name: Liz
Who are you: Parent

I have found an answer for this just by going through what two numbers can equal 13, but I would like to know how to do it with linear equations...

"The sum of the digits of a two-digit number is 13. If the digits are reversed, the new number is 9 more than the original number. Find the original number."

Thank you in advance.

Hi Liz,

If the units digit of the number is b and the tens digit is a then the number is 10 a + b.

Does this help?

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