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Question
- le périmètre dun rectangle est de 84 cm. sa longueur mesure 4 cm de plus que sa largeur.
soit,
x : la mesure de la largeur du rectangle (cm)
y : la mesure de la longueur du rectangle (cm)
quel système déquations traduit cette situation?
a) 2x + 2y = 84
x = y + 4
b) x + y = 84
x + 4 = y
c) x + y = 84
x - 4 = y
d) 2x + 2y = 84
x + 4 = y
Step1: Recall perimeter formula
The perimeter $P$ of a rectangle is given by $P = 2x+2y$, where $x$ is the width and $y$ is the length. Given $P = 84$, so $2x + 2y=84$.
Step2: Translate length - width relationship
The length $y$ measures 4 cm more than the width $x$, so $y=x + 4$ or $x=y - 4$.
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d) $2x + 2y = 84$, $x+4=y$