Shana wants to use all 62 feet of the fencing she has to make a rectangular run for her dog. She decides to make the length of the run 20 feet. She writes and solves the equation to find the width of the run.
Which statements are true of the solution?
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Step-by-step explanation:
Sketch a rectangle on a piece of paper. Label one side l and the corner side w. All the equation is saying that the perimeter is the sum of the lengths of the 4 sides. Two of the sides are length l and the other two are w so you get 2l + 2w = 62.. She makes the length 20' so that becomes the value for l. w must then be 11', just use the equation with l set to 20'
1. Not true, we just determined it's 11'
2. Not true, see above
3. w is a positive number so I would say 3 is true, little confusing.
4. is true, substitution for l = 20 is how we found w.
5. is true. You substitute l = 20 into the equation and then add -40 to each side to get the equation in the form of 2w = 22 and then you divide both sides by 2.
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