help me with this

Question

Choose the equation of the line with an undefined slope that passes through the point (-4, -2).
A. y = - 4x - 2
B. y = - 2x - 4
C. x = - 4
D. None of these.
E. y = - 2

Answer 1

Slope of a line is defined as, for any 2 points on the line, (change of y)/(change of x). For the slope to be undefined, the change of x must be zero, i.e. a vertical line. Therefore, the equation of this line is C, x=-4.