Given the data points (1,5), (3,13) and (5,21), which of the following equations describes the best-fit line?

y-hat=4+1x
y-hat=2+4x
y-hat=1+4x
y-hat=-1+4x

We're looking for a line of best fit of the form . Set up a matrix equation:



Multiply both sides on the left by the transpose of the coefficient matrix:




Multiply both sides by the inverse of the new coefficient matrix:




So we end up with a best-fit line of

Y’all got the baby baby money in