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.