Question

The length of a rectangle is twice its width. The perimeter is 30.
Find its dimensions. (Use either Matrix inversion method or
Cramer’s Rule)

Answer 1

Answer:

L=10 ,b= 5

Step-by-step explanation:

L= twice of a width (2B)

width= B

perimeter of a rectangle = 2(L+B)

2(2B+B)=30

2(3B)=30

6B= 30

B=5

then length= 10

Answer 2

Answer:

L=10, W=5

Step-by-step explanation:

perimeter formula p=2L+2W

L=2W

30=2(2W)+2W

30=4W+2W

30=6W

W=5

now,

L=2W

L=2(5)

L=10