Question

find the angle the normal makes with the positive x axis
3x-2y-1=0

Answer 1

any thoughts?

Answer 2

well i know that its tanx=3sqroot13/13/2sqroot13/13, i just dont know how to get the angle

Answer 3

a normal and a tangent are 90 degrees from each other ... they are perpendicular.

depending on how you are finding these things .... gradient f defines the normal:\[\nabla f=(f_x,f_y)\]
in this case: (3,-2)

Answer 4

quite frankly, the arctangent of (-2/3) seems apprpriate