A number is two digits.The digits.The digit at tens place is four times the digit at unit place.If 54 is subtracted from the number, the digits are reversed.Find the number
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Let number be 10x+y
x=4y is eqn 1;can be written as x-4y=0
54+10x+y=10y+x
9y-9x=54
-9(x-y)=54
X-Y=-6 is eqn 2
Solve both equations.
X=4 and y=-2
Let number be 10x+y
x=4y is eqn 1;can be written as x-4y=0
54+10x+y=10y+x
9y-9x=54
-9(x-y)=54
X-Y=-6 is eqn 2
Solve both equations.
X=4 and y=-2
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