Homework Help: math

Posted by andrew on Wednesday, February 20, 2013 at 7:29pm.

The sum of the digits of a positive two-digit number is 13,If twice the first digit is 1 less than the second digit,what is the two-digit number ?

math - Ms. Sue, Wednesday, February 20, 2013 at 7:31pm
49, 58, 67, 76, 85, or 94
math - JJ, Wednesday, February 20, 2013 at 8:12pm
Let t = ten's digit
Let x = one's digit

t + x = 13

2t= x-1 or 2t+1 = x

You can substitue for "x"

t + 2t + 1 = 13
3t = 12
t = 4 find x = 9

so we have 49

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