Question

ople 3
The length of a rectangle is 6 cm less than three times its width. The perimeter
rectangle is 140 cm. Find the dimensions of the rectangle
(by asing matrix inversion method)​

Answer 1

Answer:

let the breadth of the rectangle be b therefore its length is 3b minus 6 and according to the question perimeter of rectangle 148 metre therefore

2(length+breadth)=148

2(3b-6+b)=148

2(4b-6)=148

4b-6=74

then b= 80/4=20m and length equals to 60 minus 6 equal to 54 answer

Answer 2

Answer:

Step-by-step explanation:

Let,
length of rectangle= x
width of rectangle= y
according to the question:

=> x=3y-6
we can also write it as
x-3y=6

we also know that:

perimeter of rectangle = 2 (length+width)

140= 2(x+y)

*as 2 is being multiplied with (x+y), if we take it on the other side of =.....it will divide 140

140/2 = x+y
70 = x+y

the equations are:


x -4y = 6
x +y  =70