Use a line of best fit to predict
Use the equation of a line of best fit to predict a value, solve for the input, or interpret the slope. Unlimited questions, five difficulty levels, and a full worked solution every time — free.
Try one
A line of best fit for outdoor temperature (deg C) (x) versus hot chocolate sales (y) is y = 5x + 33. Use it to predict y when x = 5.
y = 5x + 33
Answer: 58
See one solved, step by step
A line of best fit for number of ads run (x) versus weekly sales (y) is y = 6x + 25. Use it to predict y when x = 4.
y = 6x + 25
📘 Worked solution
1y = 6(4) + 25Substitute x = 4 into the line of best fit.
2= 24 + 25 = 49Multiply, then add the y-intercept.
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