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January 30, 2015

January 30, 2015

Posted by **jen** on Sunday, March 23, 2008 at 3:03pm.

What is the number?

TIA

- algebra word prob. - one more -
**Damon**, Sunday, March 23, 2008 at 4:12pm[ab] = 10 a + b

a+b = 7

[ba] = 10 b + a = 9 + 10a + b

two equations

a + b = 7

and

10 b + a = 9 + 10 a + b

9 b = 9 + 9 a

b = 1 + a

combine

a + b - b = 7 - 1 - a

2 a = 6

a = 3

then b = 4

so answer is

34

check

34 + 9 = 43 sure enough

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