Answer
In part (a): the given values of $x_2$ (10, 20, 30) resulted in 3 straight lines with the same slope (-0.3), that is, 3 parallel lines.
In part (b): the given values of $x_1$ (40, 50, 60) resulted in 3 resulted in 3 straight lines with the same slope (1.7), that is, 3 parallel lines.
Work Step by Step
Given above.
