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The perimeter of a rectangle is 54 feet. The area of the rectangle is 176 square feet. Find the dimensions of the rectangle.

Sagot :

11 by 16

Explanation:

Set up two equations

2

x

+

2

y

=

54

x

×

y

=

176

Solving the first equation for x

2

x

+

2

y

2

y

=

54

2

y

this gives

2

x

=

54

2

y

Divide both sides by 2

(

2

x

2

)

=

54

2

y

2

This gives.

x

=

27

y

putting this value into the second equation gives.

(

27

y

)

×

y

=

176

multiplying across the parenthesis gives

27

y

y

2

=

176

subtracting 176 from both sides gives

is

27

y

y

2

176

=

0

multiplying by negative one gives

27

y

+

y

2

+

176

=

0

factoring this into y gives

(

y

11

)

×

(

y

16

)

=

0

Solving for both y's gives

y

=

11

,

y

=

16