Question

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

A. = -1 + 4x
B. = 4 + 1x
C. = 1 + 4x
D. = 2 + 4x

Answer 1

Each of the linear functions you've typed has to begin with "y="

Your function A must appear as y = -1 + 4x.

While you don't absolutely have to graph the 3 given points, doing so would help you see in a hurry which answer is the correct one.

These 3 points have 3 x-values: {1, 3, 5}, and 3 y-values: {5, 13 and 21}.

Graph the 3 points. When finished, determine whether or not they are collinear (lie on a straight line). If not, draw the best line you can that's as close as possible to all three points. Figure out the slope and y-intercept of this line, and then compare your equation with each of the four answer choices.