To express: the equation expressing the fact.
Answer to Problem 1P
The expression is
Explanation of Solution
Given information:
The sum of the digits of a two −digit number is 15.
Formula used:
Digit problems are based on our decimal system of numeration.
Step1. The problem asks for the original number.
Step2. Let t = the tens digit of the original number.
Let u = the units digit of the original number.
Step3. Use the facts of the problem to write two equations.
Step4. Solve the equations.
Calculation:
Consider ,
Let t = the tens digit of the original number.
Let u = the units digit of the original number.
Tens | Units | Value | |
Original number | t | u |
According to the question,
Hence, the expression is
Chapter 9 Solutions
Algebra: Structure And Method, Book 1
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