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# How do I show that... watch

1. Given that 3^x=9^(y-1), show that x=2y-2

Well If I substitute it into the power of x, it makes sense because 3^2 is 9 and all that but I'm not sure how I'm supposed to answer this question. I'm not great at algebra when it contains variable power

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2. (Original post by C0balt)
Given that 3^x=9^(y-1), show that x=2y-2

Well If I substitute it into the power of x, it makes sense because 3^2 is 9 and all that but I'm not sure how I'm supposed to answer this question. I'm not great at algebra when it contains variable power

Posted from TSR Mobile

3. (Original post by Mr M)

Ohhhh yeah that makes sense thanks
My brain freezes whenever I see power of a variable but it was this simple ok

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