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January 31, 2015

January 31, 2015

Posted by **Bri** on Monday, February 28, 2011 at 5:05pm.

**please show both equations and work... thanks =)

- algebra -
**Reiny**, Monday, February 28, 2011 at 6:37pmlet the unit digit be x

let the tens digit be y

then 10y + x = 8(x+y)

10y + x = 8x + 8y

2y = 7x

y = 7x/2

the number reversed would be 10x+y

then 10y+x - (10x+y) = 45

9y -9x = 45

-x+y=5

sub in the 1st equation

-x + 7x/2 = 5

-2x + 7x = 10

x = 2

then y = 7

original number is 72

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