SOLUTION: I am a two digit number,my first digit is double the second digit,i am an even number,my first digit is greater than six. What number am i ?

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Question 931355: I am a two digit number,my first digit is double the second digit,i am an even number,my first digit is greater than six. What number am i ?
Answer by ptfile(81) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = unit digit
y = tens digit
My first digit is double the second digit.
y = 2x
I am an even number
(10(2x)+x)/2
21x /2
my first digit is greater than six
2x > 6 < 10
x > 3 < 5
3 < x < 5
y = 8
x = 4
The number is 84.