The equation that can be used to find the height of the rectangles when the width is known is h = P - 4
How to find the perimeter of the rectangle
perimeter of rectangle = 2(l + h)
P(l, h) = 2(l + h)
Since the perimeter = 2(4+5) = 18, then;
18 = 2(4 + h)
9 = 4 + h
h = 9 - 4
h = P - 4
Hence the equation that can be used to find the height of the rectangles when the width is known is h = P - 4
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