Question

Find the gradient and the $$y$$-intercept of the following lines:

$$x + 4 = 0$$

Answer 1

A linear equation in slope-intercept form is $$y = mx + c$$, where $$m$$ is the gradient (slope) and $$c$$ is the $$y$$-intercept.

$$x + 4 = 0$$:

$$x = -4$$

This is a vertical line parallel to the $$y$$-axis.

Therefore, the gradient is undefined (not defined) and there is no $$y$$-intercept.