please help

find the equation of the line with the given properties. write the equation in slope intercept form if possible
1. contains (-5,6) and (4,8)
2. contains (-5,-4) and is parallel to
x=5
3. contains (-7,8) and is perpendicular to y=-6
please show how you got the answers for each one i have more to do on each but don't know how to do it

1.

y-6 = (8-6)/(4+5) (x+5)
y = 2/9 x + 64/9

2.
x=5 is a vertical line. So,
x = -5

3.
y = -6 is a horizontal line. Perpendiculars are vertical lines. So,
x = -7