document.write( "Question 280801: The perimeter of a rectangle is 70m. The length is 8m more than twice the width. Find the demensions \n" ); document.write( "
Algebra.Com's Answer #204054 by PRMath(133)![]() ![]() ![]() You can put this solution on YOUR website! Perimeters are the measure of a shape all the way around the shape. In the case of a rectangle then, the perimeter is made up of TWO lengths and TWO widths. If we say \"L\" is length and \"w\" is width, then our equation can be:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "L + L + w + w = 70. \r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "According to your information, the Length is 8 meters more than twice the width. Let's break that down to the following:\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "The Length: L \n" ); document.write( "is: = \n" ); document.write( "8 meters more than: 8 + \n" ); document.write( "Twice the width: 2w\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "In other words, the equation is: L = 8 + 2w.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Now let's write that down according to what we said about the perimeter. I mean to say that we agreed with the following:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "L + L + w + w = 70 Let's plug in what we know for \"L\" \n" ); document.write( "(8 + 2w) + (8 + 2w) + w + w = 70 See where we plugged in (8 + 2w) for the L variable? Now let's combine like terms.\r \n" ); document.write( "\n" ); document.write( "16 + 6w = 70 Now let's subtract 16 from both sides to begin to isolate the w. \n" ); document.write( "6w = 70 - 16 \n" ); document.write( "6w = 54 Now let's divide both sides by 6 to further isolate the w. \n" ); document.write( "w = 9\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "AH! Now we know that the width is 9.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "If the Length is 8 meters more than 2 times the width, we can use that equation again.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "L = 8 + 2w \n" ); document.write( "L = 8 + 2(9) See where we plugged in 9 for the Width? \n" ); document.write( "L = 8 + 18 (2 times 9 = 18) \n" ); document.write( "L = 26\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "SO now our width is 9 and our length is 26. Does this work? Let's see:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "L + L + w + w = 70 \n" ); document.write( "26 + 26 + 9 + 9 = 70 \n" ); document.write( "70 = 70 YES! It works. Yay!\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "I hope this helps you. :-) \n" ); document.write( " |