Consider y=7. Which of the following is perpendicular to it? A. y=-1/7 B. y=8 C.x=6 D. y=1/7x-4

Answer 1

The line y=7 is a line parallel to x-axis and the slope of the line is m=0.

The product of the slopes of two perpendicular lines is -1.

Therefore, the slope of the required line should be -1/0 or undefined. In other words, the line should be parallel to y-axis. So, any line that is of the form x=k is perpendicular to y=7.

Option (C) x=6 is the answer.