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January 25, 2015

January 25, 2015

Posted by **Anonymous** on Tuesday, March 18, 2014 at 9:17pm.

X Rule Y

10 65

30 45

50 25

70 5

I can't find the rule

- Math -
**Reiny**, Tuesday, March 18, 2014 at 10:02pmDid you not notice that for every increase of 20 in the x's there is a decrease of 20 in the y's

so the slope is (45-65)/(30-10) = -1

so y = -x + b

using x=10, y = 65

65 = -10 + b

b = 75

y = -x + 75

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