AB has a slope of -3 / 3 = -1.[br][br][list][*]When k=2, A'B' has a slope of -6 / 6 = -1[/*][*]When k=3, A'B' has a slope of -9 / 9 = -1[/*][*]When k=4, A'B' has a slope of -12 / 12 = -1[/*][*]When k=5, A'B' has a slope of -15 / 15 = -1[/*][/list][br]The dilated line segments have the SAME slope as the preimage line segment.

AB has a length of 4 units.[br][br][list][*]When k=0.5, A'B' is 2 units long, or HALF the length of AB[/*][*]When k=2, A'B' is 8 units long, or DOUBLE the length of AB[/*][*]When k=3, A'B' is 12 units long, or TRIPLE the length of AB[/*][*]When k=4, A'B' is 16 units long, or FOUR times the length of AB[/*][/list][br]The dilated line A'B' is the same line as AB, just smaller or larger.

In question 1, the center of dilation was NOT ON the preimage line, AB. The dilated line, A'B' was PARALLEL to the preimage line.[br][br]In question 2, the center of dilation was ON the preimage line, AB. The dilated line, A'B' is the SAME LINE as the preimage line, just larger or smaller.[br][br]