SOLUTION: the ten digit of a two digit number is thrice the unit digit. the number is 9 more than 7 times the sum of the digits. find the number

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Question 897520: the ten digit of a two digit number is thrice the unit digit. the number is 9 more than 7 times the sum of the digits. find the number
Answer by lwsshak3(11628) About Me  (Show Source):
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the ten digit of a two digit number is thrice the unit digit. the number is 9 more than 7 times the sum of the digits. find the number
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let u=units digit
let t=tens digit
t=3u
..
10t+u=7(t+u)+9
10t+u=7t+7u+9
30u+u=21u+7u+9
3u=9
u=3
t=3u=9
number: 93