Verified answer

If y varies inversely as x and y = 10 when x = 5, find y when x = 10.

• yx = k
• y = 10, x = 5
• 10 · 5 = k
• 50 = k

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• y = ?, x = 5, k = 50
• yx = k
• y · 5 = 50
• y = 50/5
• y = 10

• 10 is the answer, but I see in the choices that there are two 10's.