37.
A 2 digit number is 7 times of its sum, and 21 times of its difference. If the number is xy, then describe the
simultaneous equation.
A.
B.
7x + 7y = xy; 21x - 21y = xy
7xy - 7y = x; x - 21xy = 21y
C.
D.
x - y = 7; x + y = 21
x + y = 7; x - y = 21
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Answer:
Answer is A. 7x+7y = xy; 21x -21y = xy
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