Lesson 12
Solving Problems with Algebra
Practice Exercise 12-1 Answer Key

Directions: If you get less than 8 items correct, please review the instruction.

1. What is eight increased by five?  Let x be the unknown, then: 8 + 5 = x, so x = 13
    
2. What is 19 increased by 7 times y?  19 + 7y
    
3. What is 7 more than 3?  Let x be the unknown, then: x = 3 + 7, so x = 10
    
4. What is 2 more than twice y ?  2y + 2
    
5. What is 6 less than 5 times a number?  Let x be the number, then: 5x - 6
    
6. What is a number divided by 3?  Let x be the number, then:
    
7. What is 2a more than 2b?  2a + 2b
    
8. What is x less than a divided by b ?  - x
    
9. What is 4 times the sum of x + y ?  4(x + y).
    
    
10. What is 16 plus twice x - y?  2x - y + 16.