3^x+y=27 and 3^x-y=243, then x =
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Explanation:
Given, 3x−y=27 and 3x+y=243
3x−y=33
3x+y=35
Takin log to the base 3 on both sides for both the equations
x−y=3 and x+y=5
Adding them,
x−y+x+y=8
2x=8
x=4
Thus, 4−y=3
y=1
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