the difference between two digits of a number is 7. The difference between their interchanged digits is 63. Find the numbers.
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x-y=7
-x-y=63
equation 1and 2
x=y+7
put the value of X in 2
-7-y-y=63
-2y=56
y=-23
put value of y in 1
x+23=7
x=7-23
x=-16
so
x=-16
y=-23
-x-y=63
equation 1and 2
x=y+7
put the value of X in 2
-7-y-y=63
-2y=56
y=-23
put value of y in 1
x+23=7
x=7-23
x=-16
so
x=-16
y=-23
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