Question 781894
9. A friend say the slope of a line passing through (1,7) and (3,9) is equal to the ratio 1-3/7-9. What is your friend's error?
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slope = diffy/diffx
He has diffx/diffy, the inverse.
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Plus, someone should add parentheses --> (3-1)/(9-7)
Not 1 - (3/7) - 9