<span> Undefined slope is when the line is vertical, and the slope is infinite (technically); Any y value is irrelevant in this kind of line, so in slope intercept, the equation is x = -3.; Putting it in standard form, you get x + 3 = 0; The first choice is correct.</span>
If the value of the slope is undefined, it means that the line that we are to find is vertical. This means that we only needs to care about the value of x and not of y. The equation is, x = -3 In general form, x + 3 = 0 The answer is the first choice.
