Robert says that the slope of a line passing through (1,7) and (3,9) is equal to the ratio 1-3/7-9. Is this a correct method for calculating the slope? Explain your answer.

A slope is also known as the gradient of a line. The method through which Robert has calculated the slope is wrong.
A slope also known as the gradient of a line is a number that helps to know both the direction and the steepness of the line.
slope = (y₂-y₁)/(x₂-x₁)
The statement given by Robert is that "the slope of a line passing through (1,7) and (3,9) is equal to the ratio 1-3/7-9", which is wrong the reason that the slope of the line is the ratio of the difference of y coordinates to ration of x coordinates. But since Robert has taken the ratio wrong.
We can conclude that the method through which Robert has calculated the slope is wrong.
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