Question 309420: The sum of the digits of a certain two digit number is 7. The reversing digit increase the number by 9 Answer by Stitch(470) (Show Source):
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Equation 1:
Equation 2:
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Solution:
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Solve equation 1 for one of the variables
I solved for B
Equation 1:
Now plug (7 - A) into equation 2 for B
Equation 2: Simplify Simplify Add 9A to both sides Subtract 16 from both sides Divide both sides by 18
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Now plug 3 into equation 1 for A
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