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There is not enough information to solve this. We need to know more about the function that passes through the point (0.5,7.5) in order to know what happens at x = -0.3.

For example, there are an infinite number of straight lines in the form y = mx + b that would satisfy the x & y coordinates that you have given, not to mention an infinite number of other functions: example: y = bx or y = xa, or y = k*sin(x), for example.

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13y ago
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Q: If y equals 7.5 when x equals 0.5 find y when x equals -0.3?
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