Hi guys,I need help on find an equation for these problems,here's how it looks like:

Write an equation for each line.Then graph the line.

38. through (-2,1) and parallel to y=-3x+1

39. through (-3,-1) and perpendicular to y=-2/5x-4

40. through (-7,10) and horizontal

41. through (1,-2/7)and vertical

Now the first two,I know how to do,but the second two are the ones I don't know how to do.Please help me.

Thanks in advance.