A slope is also known as the gradient of a line. The slope of the function is -4, Thus, the correct option is D.
What is Slope?
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.
The slope of the function is,
m = (13-5)/(-2-0) = 8/-2 = -4
Hence, the slope of the function is -4, Thus, the correct option is D.
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