Which expression can be simplified to find the slope of the trend line in the scatterplot? On a graph, a trend line goes through points (2, 87) and (8, 78).

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take the logarithm of both sides (the base of the log doesn't matter):

apply the exponent property - this says that :

distribute the log terms on both sides:

group like terms together:

divide through both sides by the coefficient on :

you can do some additional rewriting here using the properties of the logarithm to simplify things if you like:

96 cm is the answer.