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Ella and her study team are arguing about the slope of the line in the graph below. They have come up with four different answers: , , and . Which slope is correct? Justify your answer. 

A decreasing line, going through the points, (negative 3, comma 3) and (5, comma negative 3).

Remember that the slope can be written as .

On this line as the -value increases, does the -value decrease or increase?
Decreasing makes the slope negative.
Increasing makes the slope positive.

Try answering this problem by going from the point to the point .