kimye21
The length of a rectangle is 3 inches more than three times the width. The perimeter is 78 inches. Find the length and width.



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Shironlom
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dw:1348709556519:dw

Mertsj
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dw:1348710092420:dw

Mertsj
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Add all the sides and set it equal to 78

kimye21
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how do i get the length

Mertsj
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Did you find w, the width?

kimye21
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i got 25 for the width

Mertsj
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How did you get that?

kimye21
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i added the sides like said

kimye21
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3w+3+w=78

kimye21
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is that wrong

Mertsj
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dw:1348710695880:dw

Mertsj
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You must add ALL FOUR sides to get the perimeter.

kimye21
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how do i fond the length

kimye21
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find

Mertsj
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Look at the picture. The width is w and the length is 3w + 3

kimye21
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so i just plug in the width and i get my answer

Mertsj
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What is w?

kimye21
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9

Mertsj
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What is 3w?

kimye21
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do u mean 3*9 or 3w more than the width

Mertsj
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3w means 3 times w so if w is 9 then 3w means 3 times 9 which is 27. So 3w = 27.
Now what is 3w + 3?

kimye21
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30

Mertsj
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So what is the length of the rectangle?

kimye21
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w is 9 and the length is 30

Mertsj
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Good job!!

Mertsj
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Does that make the perimeter 78?