Given that (5,4) is on the graph of f(x), find the corresponding point for the function f(-1/3x).

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Given that (5,4) is on the graph of f(x), find the corresponding point for the function f(-1/3x).

Mathematics
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This question is phrased a little strangely which makes it hard to understand exactly what they want. But consider this, 1. We know that (5,4) is on the graph of f(x). That is, "When x = 5, then y = 4." 2. This means that f(5) = 4. In English, "When x = 5, then y = 4." (same thing) 3. We are to find the "corresponding point" for f(-1/3x). This sounds weird. 4. But, all we know is that f(5) = 4. This is the only information we have. 5. But look! I can be clever and do this... 6. Take f(-1/3 x) and plug in x = -15. Then, 7. f(-1/3 * -15) = f(5) = 4. 8. So the corresponding point must be x = -15 and y = 4. That is, (-15, 4).
@jtvatsim You're a life saver. I'm still slightly confused on this but you explained this very well. Could you help me solve another one?
Glad to help in any little way. If you had any questions on this one, just let me know. It had me stumped for awhile myself... :) Feel free to post a new question on the site so that everyone can see it.

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