Question 1072278
Use x for the tens digit and y for the unit digits in the two digit numbers. Find the two-digit number which is 2 times the sum of its digits
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{{{10x+y=2(x+y)}}}


{{{10x+y=2x+2y}}}

{{{8x=y}}}

{{{y=8x}}}--------simple linear equation.


You know that you are looking only for DIGITS.  Very few possibilities.
x=1?
y=8.
-
x=2?
y=16, which is NOT a digit.