On a straight-line graph, what does the gradient measure?

1. A straight line graph is written in the standard form with a gradient and a constant. 2. The gradient of a line is the measure of steepness. 3. Steepness is the ratio of the vertical change to the horizontal change. 4. The constant term is the y-intercept, which tells you where the line cuts the vertical axis instead. _Source: Siyavula Mathematics Grade 10 (Everything Maths, CC BY 4.0), Chapter 6: Functions_