19. The tens digit in a two digit number is twice the unit's digit. if subtracted from the number, the digits are reversed.find the number
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let x be tens place and y be ones place
No: = 10x+y
Case 1;
10x =2y
10x-2y=0
5x-y=0. ------(1)
Case 2;
10y-x=10x+y
10y-y = 10x -x
9y = 9x
9x -9y =0. ----------(2)
45x -9y = 0
9x - 9y = 0
---------
36x = 0
ie; x= 0
9x -9y =0
-9y =0
y =0
is this correct
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