Mathematics

Problem

When constructing a slope field for

\dfrac{dy}{dx}=\dfrac{y}{x}

on a lattice of integer points, which vertical line(s) in the

xy

-plane must be left blank because the slope is undefined there? a) only

y=0

b) both

x=0

and

y=0

c) only

x=0

d) no entire vertical line—just the point

(0,0)