Question 970728
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x and y are 2 numbers
x+y=77
x-y=1 Add the equations.
2x=78
x=39 ANSWER 1: One of the numbers is 39.
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x-y=1
39-y=1 Add y to each side.
39=1+y Subtract 1 from each side.
38=y ANSWER 2: The other number is 38.
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CHECK:
x+y=77
39+38=77
77=77
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x-y=1
39-38=1
1=1