Question

Alrite here's another. The length of a rectangle is twice its width. If the area of the rectangle is 50ft , find its perimeter.
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Answer 1

ok so this is a system of equations:

lets say:
x=width
y=length
so the wuestion tells us that:

y=2x

and it says that:

50=(y)(x)
if we substitute y into x:
50=(2x)(x)
25=x^2
x=5
using our equations:
y=2(5)=10

so the perimeter of the rectangle is just:

P=2x+2y
P=2(5)+2(10)=30