Let the width of the rectangle be y cm.
Perimeter of a rectangle = 2(length + width)
Given:
Perimeter = 42 cm
Length = x cm
So, 42 = 2(x + y)
=> 42 = 2x + 2y
=> 21 = x + y
=> y = 21 - x
Therefore, the width of the rectangle in terms of x is 21 - x cm.
The perimeter of a rectangle is 42 cm and it's length is x cm. Find it's width in term of x
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