# Pre Calc

the units digit of a 2 digit number is 4 less than the tens digit. the number it names is 3 less than 9 times the sum of the digits what is the number?

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1. let the tens digit be x
then the unit digit is x-4

the number itself is 10x + (x-4)
sum of the digits is x + x-4 = 2x - 4

10x + x-4 = 9(2x-4) -3
11x-4 = 18x - 36 - 3
-7x = -35
x = 5

tens digit is 5, unit digit is 1
the number id 51

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posted by Reiny
2. Thank you!

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posted by Courtney

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