Rene Decartes is the father of Analytical Geometry. He was a French Mathematician and theologian who is believed to have discovered the slope formula according to many experts. He was said to have provided a method to solve the problem of lines and slopes in mathematics by his prowess in Algebra and Geometry.The basic slope formula is y=mx+b while the more complex point-slope formula is y-yl=m(x-x1).
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Renee Descartes
the formula used to calculate a slope is: m=y2-y1/x2-x1
The answer depends on what information you have.
architects
you look at the line and see if there are any direct points on the line the slope formula