SOLUTION: The length of a rectangle is 2 ft less than 3 times it's width. The perimeter is 12 ft. Find the length of the rectangle.

Question 828080: The length of a rectangle is 2 ft less than 3 times it's width. The perimeter is 12 ft. Find the length of the rectangle.
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
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x = 3y - 2
2x + 2y = 12
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put the system of linear equations into standard form:
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x - 3y = -2
2x + 2y = 12
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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 = 4 ft
y = 2 ft
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system matrix
1 -3
2 2
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inverse of system matrix
0.25 0.375
-0.25 0.125
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determinant of system matrix = 8
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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:
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