d = k x + b by the way b is un stretched length
12 = 2 k + b
18 = 5 k + b
----------------- subtract
-6 = -3 k
k = 2 then b = 8
25 = 2 m + 8
The length of a spring is a linear function of the mass of the object hanging from it. For a particular spring, the length was 12 centimeters when a 2-kg mass was attached to it. When a 5-kg mass was hung from it, it stretched to a length of 18 cm. How much mass must be hung from this spring for it to stretch to 25 cm?
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