Question

Which steps did you use in your solution? Check all of the boxes that apply.

wrote the ordered pairs (5, 2.70),
(11, 3.24), and (20, 4.05)

used two of the ordered pairs to find the slope

wrote the point-slope form for a linear equation

substituted the slope and the coordinates of one of the points to write the equation of the line

Answer 1

All of the above.

Brief check: slope between (5,2.70) and (11,3.24) = (3.24−2.70)/(11−5) = 0.54/6 = 0.09; between (11,3.24) and (20,4.05) = 0.81/9 = 0.09, so the points are collinear. Point-slope form with slope 0.09 and point (5,2.70): y − 2.70 = 0.09(x − 5), which simplifies to y = 0.09x + 2.25.