if 3x + y = 81 and 81x - y = 3, then what is the value of x ?

1.	if 3^{x + y} = 81 and 81^{x - y} = 3, then what is the value of x ?
A.	17/16
B.	17/8
C.	17/4
D.	15/4
Answer» C. 17/4

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if 3x + y = 81 and 81x - y = 3, then what is the value of x ?

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if 3^{x + y} = 81 and 81^{x - y} = 3, then what is the value of x ?