What is the slope of the line joining (10,9) and (40, 3)?
a. -5
b.-4
c.-1/5
d.1/5

Step-by-step explanation:

m = (y2 - y1) / (x2 - x1)

m = (3 - 9) / (40 - 10)

m = -6/30

m = -1/5

c. is the correct answer.

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.

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step-by-step explanation:

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