Question

Which of these is a trend line for the data set​ shown? Use x to represent the number of minutes and y to represent the altitude of the balloon.
A.y equals negative 17.8 x plus 474
y equals negative 17.8 x plus 474
B.y equals negative 8.9 x minus 474
y equals negative 8.9 x minus 474
C.y equals 8.9 x minus 474
y equals 8.9 x minus 474
D.y equals 8.9 x plus 474
y equals 8.9 x plus 474

Answer 1

D. y = 8.9x + 474

Reason: the points start near y = 474 at x = 0 and the altitude increases with time, so the trend line has a positive slope (8.9) and a positive intercept (474).