Answer:
C. Equation: x=4
D. Slope: undefined
Step-by-step explanation:
If a line is perpendicular to the x-axis, then it is a vertical line because the x-axis is horizontal.
The slope of a vertical line is undefined.
The equation of a vertical line through [tex](x_1,y_1)[/tex] is [tex]x=x_1[/tex]
Since the vertical line passes through (4,-2), its equation is
[tex]x=4[/tex]
