Practice the problems of Math in Focus Grade 8 Workbook Answer Key Chapter 5 Systems of Linear Equations to score better marks in the exam.

## Math in Focus Grade 8 Course 3 A Chapter 5 Answer Key Systems of Linear Equations

### Math in Focus Grade 8 Chapter 5 Quick Check Answer Key

**Complete the table of values and graph each linear equation.**

Question 1.

y = 5x

Answer:

When x = 0, y=0,

x =1 , y = 5, x = 2, y = 10, when x = 3 y =15,

Explanation:

Question 2.

y = -x + 2

Answer:

x =0, y = 2, x= 1, y =1,

x= 2, y = 0, x =3,y =-1,

Explanation:

**Solve. Show your work.**

Question 3.

Samuel bought 30 books. The hardcover books cost $20 each while the rest,

which are paperbacks, cost $8 each. If he spent a total of $480, how many paperbacks did he buy?

Answer:

Number of paperbacks he buy are 10,

Let x be the no. of hard cover books and y be the no. of paper back books.

x + y = 30,

x = 30 – y,

20x + 8y = 480,

20(30 – y) + 8y = 480,

600 – 20y + 8y = 480,

-12y = – 120,

y = 120/12, y = 10,

x = 30-10 = 20,

No.of hard cover books = x = 20,

No.of paper back books = y = 10.