100 points plus !

1.)what is the slope of a line that is perpendicular to a line whose equation is 5y=10+2x ?

2.)line a is represented by the equation y=−2x+3 .
how do these equations compare to line a?
categories: parallel to line a, perpendicular to line a, neither parallel nor perpendicular to line a. equations: y=2x-1, y=-2x+5, y=1/2x+7. *put the equations into the categories*

3.)what is the equation of a line that passes through the point (5, −4) and is parallel to the line whose equation is 2x + 5y = 10?

4.)what is the equation of a line that passes through the point (4, 2) and is perpendicular to the line whose equation is y=x3−1 ?