Monday
December 22, 2014

Homework Help: math

Posted by guitarman on Monday, March 29, 2010 at 12:22pm.

According to the center of Science in the Public Interest, the maximum healthy weight for a person who is 5 feet, 5 inches is 150 pounds and the maximum healthy weight for a person 6 feet, 3 inches tall is 200 pounds. The relationship between weight and height is linear.

When I saw the word LINEAR, I immediately thought about y = mx + b.

Find an equation that gives the maximum healthy weight y for a person whose height is x inches over 4 feet, 10 inches.

HINTS GIVEN IN MATH BOOK:

x = 0 represents a person 4 feet, 10 inches
x = 2 represents a person 5 feet tall, etc.

The correct equation is y = 5x + 115. I was able to find the slope 5 and got as far as y = 5x. My question is: where did 115 come from?

I look forward to your insight and guidance.

Thanks

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