**1. What is the gradient of a vertical line?**

The gradient of a vertical line is undefined. This is because the denominator of the gradient fraction i.e. the change in x, would be zero and division by zero is impossible in mathematics.

**2. Is it also not possible to find the gradient of a horizontal line?**

The gradient of a horizontal line is

ZERO.

**3. ****What angle is a line with a gradient of 1?**

A line with a gradient of 1 makes an angle of 45

°with the horizontal.