If a line passes through (−4, −2) and (−4, 5), which statement is correct about this line?

• A. The slope is (5 − (−2))/(−4 − (−4)) = 7, so the line has slope 7 and equation y = 7x + b.
• B. The line is vertical: x = −4, with undefined slope, so slope-intercept form y = mx + b is not applicable.
• C. The line can be written as y = mx + b by finding m using the rise over run between the given points, and then calculating b as usual.
• D. The slope is 0 since the y-values are different but the x-values are equal, giving a horizontal line y = constant

Answer: (B)