Question 696972
x = width
2x = length   {twice as long as it is wide}


Perimeter of a rectangle is 2(width) + 2(length)


2x + 2(2x) = 84   {perimeter is 2(width) + 2(length)
2x + 4x = 84   {multiplied}
6x = 84   {combined like terms}
x = 14   {divided each side by 6}
2x = 28   {substituted 14, in for x, into 2x}


width = 14 cm
length = 28 cm
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