Question

Write the equation for a line that is perpendicular to the line y = −1 and passing

through the point (12, −39).

Answer 1

x= 12

Explanation:

Slope-intercept form

y= mx +c, where m is the gradient and c is the y-intercept.

y= -1

y= 0x -1

The given line, y= -1, is a horizontal line as it has a gradient of zero.

A line perpendicular to a horizontal line is a vertical line, and its equation is written as x= ___.

Since the vertical line passes through the point (12, -39), its equation is x= 12.