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The steepness of a line graph is called the "gradient" ------------------------------- or slope.
The change in the y-value over the x-value, the slope, m, (y1-y2)/(x1-x2).
Rene Descartes did not create slope. Slope as a mathematical concept was developed independently by several mathematicians over the centuries. The concept of slope is a measure of the steepness of a line and is calculated as the ratio of the vertical change to the horizontal change between two points on the line. Descartes did, however, make significant contributions to the development of analytic geometry, which laid the foundation for the modern understanding of slopes and equations of lines.
The slope equals 3
I'm not a pro, but if it's just a few degrees more than 2%, (standard slope required) you're probably fine. More would be better than not enough. It depends on the situation. If it's straight up-and-down, you may have problems.