### Home > CC3 > Chapter 7 > Lesson 7.1.2 > Problem 7-20

7-20.

a. 6

*x*−*y*= 4

3*x*+*y*= 51. (0, –4)

b.

*x*=*y*+ 4

2*x*+ 3*y*= −122. (3, 7)

c. 5

*x*− 2*y*= 1

*y*= 2*x*+ 13. (1, 2)

12

5

6

4

Use the rectangle at right to answer the following questions. Homework Help ✎

Find the area of the entire rectangle. Explain how you found your solution.

Calculate the perimeter of the figure.

The area of a figure is the same as the sum of the area of its parts.

72 + 30 + 48 + 20

The perimeter of a figure is the sum of its sides.

54 units