Parallel and Perpendicular lines

Please help me with these. I can't understand them at all! I don't need just answers, I want to understand how to solve each one of them. Please help!

Write an equation in slope-intercept form of the line in parallel to the graph of each equation and passes through the given point.

1. y=4x+5; (2,-3)

2. y=-1/2x-3; (0,0)

3. y=4; (2, 5)

4. 3x+y=3; (3, 5)

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Write an equation in slope-intercept form of the line that is perpendicular to the graph of each equation and passes through the given point.

1. y=2x+3; (3, -4)

2. y=-4x+5; (1, 1)

3. 2x-5y=3; (-2,7)

4. x=6; (4,2)

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Determine whether AB or CD are parallel, perpendicular, or neither.

1. A(4, 3), B(5, 2), C(8, 3), D(9,2)

2. A(-2, 3), B(4,0), C(2, 5), D(-1, 11)

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Wirte an equation in slop intercept form of each line.

- passes through the point at (4, -2) and is parallel to the graph of 5x-2y=6
- perpendicular to the line through points at (1,2) and (8,6) and passes through the point at (0, 5)