Maggie's brother is 9 years younger than three times her age. the sum of their ages is 43. how old is maggie?

Maggie's age is 13 years

Step-by-step explanation:

Let

x > Maggie's brother age

y > Maggie's age

we know that

x+y=43 > equation A

x=3y-9 > equation B

substitute equation B in equation A and solve for y

(3y-9)+y=43

4y=43+9

4y=52

y=13

therefore

Maggie's age is 13 years

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk

because that’s us why