Find x for a predicted y on a line of best fit
Set the equation equal to the given y and solve for x.
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A line of best fit for age of a car (x) and its price (y) is y = 6x + 7. For what value of x does the line predict y = 49?
Answer: 7
A line of best fit for hours of sleep (x) and minutes to fall asleep (y) is y = 4x + 36. For what value of x does the line predict y = 64?
Answer: 7
A line of best fit for hours studied (x) and test score (y) is y = 8x + 17. For what value of x does the line predict y = 97?
Answer: 10
Tip: Set the equation equal to the given y and solve for x.
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