Find the slope from the equation of the line described. i need answer for 15 16 17 18 19 20 21 22

15through (4,-1,) parallel to y= negative 3/4x
16through (4,5,) parallel to y= negative 1/4x negative 4
17through (-2,-5,) parallel to y= x + 3
18through (4,-4,) parallel to y= 3
19through (-3,-3,) perpendicular to y= negative 3/8x negative 2
20through (0,-4,) perpendicular to y= negative 3/2x plus 1
21through (1,-3,) perpendicular to y= negative x
22through (2,4,) perpendicular to y= negative x plus 5