Homework Help: Math

Posted by Sammi on Monday, February 15, 2010 at 8:33pm.

The perimeter of a rectangle is 74 centimeters. The width is doubled and the length is halved. The new rectangle has a perimeter of 76 centimeters. Find the dimensions.

Okay, so in class we're learning about Systems of Equations. What are the equations for this? How do I define the variables?

Math - PsyDAG, Tuesday, February 16, 2010 at 11:18am
2W + 2L = perimeter = 74

2W = 74 -2L

2(2W) + 2(L/2) = 76

Substitute 74 - 2L for 2W in the last equation and solve for L. Put that value in the first equation to find W. Check by putting both values into the last equation.

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