Algebrahard · Past Paper
Solve: 3^(x+y) = 243 and 243^(x-y) = 3. Find x.
A2.6
B2.4
C3
D2
✓ Correct Answer: A — 2.6
x+y=5 and 5(x-y)=1 -> x-y=0.2. Adding: 2x=5.2 -> x=2.6.
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