A rectangle has a perimeter of 23cm. Its area is 33cm². Determine the dimensions of the rectangle. Can anyone help?
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Originally Posted by xcompulsion A rectangle has a perimeter of 23cm. Its area is 33cm². Determine the dimensions of the rectangle. Can anyone help? Perimeter: . Area: . Solve these equations simultaneously.
Originally Posted by Prove It Perimeter: . Area: . Solve these equations simultaneously. Hi again, could you maybe help me start it off?
Originally Posted by xcompulsion Hi again, could you maybe help me start it off? Use one of the equations to isolate a variable, then substitute that into the other equation, for example Substitute: Solve for , then use either equation to find given .
Originally Posted by undefined Use one of the equations to isolate a variable, then substitute that into the other equation, for example Substitute: Solve for , then use either equation to find given . okay so after solving for w, so does w = 6, or 5.5?
This just means that there are two rectangles that could have these dimensions. Substitute both into the perimeter formula and solve for .
Originally Posted by Prove It This just means that there are two rectangles that could have these dimensions. Substitute both into the perimeter formula and solve for . Substitute both of them? I'm sorry, I don't really understand.
Originally Posted by xcompulsion Substitute both of them? I'm sorry, I don't really understand. If you take , you will get . If you take , you will get . You get the same rectangle either way :-)
Originally Posted by xcompulsion Substitute both of them? I'm sorry, I don't really understand. Substitute one of them into the equation. Solve for . Then pretend you hadn't done that, and substitute the second into the equation. Solve for .
Oh! Okay, I understand now. Thanks a lot.
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