Angles made by the line with the positive direction of X-axis are given. Find the slope of these lines.

(1) 45°

(2) 60°

(3) 90°

If A (-14, -10), B(6, -2) is given, find the coordinates of the points whichdivide segment AB into four equal parts.

If A (20, 10), B(0, 20) are given, find the coordinates of the points which divide segment AB into five congruent parts.

Find the slopes of the lines passing through the given points.

(1) A (2, 3), B (4, 7)

(2) P (-3, 1), Q (5, -2)

(3) C (5, -2), D (7, 3)

(4) L (-2, -3), M (-6, -8)

(5) E(-4, -2), F (6, 3)

(6) T (0, -3), S (0, 4)

Determine whether the following points are collinear.

(1) A(-1, -1), B(0, 1), C(1, 3)

(2) D(-2, -3), E(1, 0), F(2, 1)

(3) L(2, 5), M(3, 3), N(5, 1)

(4) P(2, -5), Q(1, -3), R(-2, 3)

(5) R(1, -4), S(-2, 2), T(-3, 4)

(6) A(-4, 4), K(-2, 5/ 2 ), N(4, -2)