SOLUTION: what is the the length, in feet, of a rectangle that has a perimeter of 54 feet and a width of 6 feet?

Question 829702: what is the the length, in feet, of a rectangle that has a perimeter of 54 feet and a width of 6 feet?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
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2x + 2y = 54
y = 6
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copy and paste the above linear system in standard form into this matrix-method solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
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solution:
x = length = 21 ft
y = width = 6 ft
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system matrix
2 2
0 1
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inverse of system matrix
0.5 -1
0 1
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determinant of system matrix = 2
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Solve and graph linear equations:
https://sooeet.com/math/linear-equation-solver.php
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Solve quadratic equations, quadratic formula:
https://sooeet.com/math/quadratic-formula-solver.php
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Solve systems of linear equations up to 6-equations 6-variables:
https://sooeet.com/math/system-of-linear-equations-solver.php
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