The perimeter of the rectangle is 28 cm. Its length is 4 cm more than the width. Find the length and width of the rectangle.

It is known from the condition that the perimeter of the rectangle is 28 cm, and its length is 4 cm more than its width. In order to find the length and width of the rectangle, we compose and solve a linear equation.
Let’s denote with the variable x cm the width of the rectangle, and write the length as (x + 4) cm.
Let’s remember the formula for finding a rectangle:
P = 2 (a + b);
Substitute the values and solve the equation.
2 (x + (x + 4)) = 28;
x + x + 4 = 14;
2x = 14 – 4;
2x = 10;
x = 5 cm rectangle width, 5 + 4 = 9 cm rectangle length.