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Mathematics 18 Online
OpenStudy (anonymous):

A weight of 15 ounces stretches a spring 10 inches. A weight of 24 ounces stretches the same spring 16 inches. How many inches does the spring stretch per ounce of additional weight ?

OpenStudy (mathstudent55):

Use (10, 15) and (16, 24) as two points of a straight line. Find the equation of the line. Then find y for x = 25, and subtract 16 from it.

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