When trading forex, you always speculate on whether the price of the base currency will rise or fall against the counter currency. So in AUD/USD if you think AUD will rise against USD, you go long (buy) the currency pair. Alternatively, if you think AUD will fall against USD (or that USD will rise against AUD), you go short (sell) the currency pair.
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If traders are positive on the prospects for the Yen, they would expect the number on the right to go down – i.e. the Yen would be getting stronger against the Dollar. Traders would be buying less Yen with a Dollar as the Yen got stronger. Similarly, if the Yen was expected to weaken, forex traders would expect the Yen number to go up, reflecting the fact that the dollar could buy more yen.