SOLUTION: the ones digit of a two digit number is twice its tens digit. if the sum of its digits is 12, what is the number?

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Question 665974: the ones digit of a two digit number is twice its tens digit. if the sum of its digits is 12, what is the number?
Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
Establish variables
x = tens place
y = ones place
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Given
y=2x
x+y=12
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Substitute y into the second equation
x + 2x = 12
3x = 12
highlight%28x+=+4%29 as the digit in the tens place.
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Rearranging y=2x as x = y%2F2, substitute into the second equation
%28y%2F2%29+%2B+y+=+12
Multiply the entire equation by 2 to be rid of the fraction.
y + 2y = 24
3y = 24
highlight%28y+=+8%29 as the digit in the ones place.
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The number is highlight%2848%29
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Check cartoon%28%0D%0A4+%2B+8%2C+12%2C%0D%0A%284%29%282%29%2C8%29
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