[SPLIT] Find width, given perimeter of rectangle and....

[latinchika]

the length of a rectangle is twice the width; the perimeter is 42 inches find the width.

 

[skeeter]

the length of a rectangle is twice the width; the perimeter is 42 inches find the width.

the length of a rectangle is twice the width ...
L = 2W

the perimeter is 42 inches ...
2L + 2W = 42

2 equations, 2 unknowns ... solve for W.