ethanyayger
19.07.2019 •
Mathematics
The length of a rectangle is 4 centimeters less than twice its width. the perimeter of the rectangle is 34 cm. what are the dimensions of the rectangle? length = 7 cm; width = 10 cm length = 10 cm; width = 7 cm length = 9 cm; width = 8 cm length = 14 cm; width = 9 cm
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Ответ:
Let L=length and W=Width.
The length of a rectangle is 4 centimeters less than twice its width.
This would mean that:
L= 2w-4
To find the perimeter of a rectangle you add all sides together. This would be shown as 2L+2W
Therefore, 2L+2W= 34
Since this equation has two unknowns, you cannot solve it; but we know that L=2W-4
So if we substitute that into the equation of the perimeter, you would get:
2(2W-4)+2W=34.
This only has one unknown so we can solve it. Here are the steps:
2(2W-4)+2W=34
4W-8+2W=34
6W-8=34
6W=42
W=7
Now that we know what W is we can work out L.
L=2W-4
L=14-4
L=10
So W=7 and L=10!
This shows that the length is 10cm and the width is 7cm.
Ответ:
37 + 6 y = − y − x 2 − 24 x
Step-by-step explanation: