Question

Review

Directions: Use substitution to solve the following;

Simplify the following if x = 2 & y = 5:

1. 3x + y =

2. 3x + 2y =

3. 3y + 2x =

4. 10x + 4y + 7x =

5. 8y + 5x =

6. 7x + 4y =

Use your knowledge about parentheses and substitution to solve the following:

q = 1; r = 2; s = 3; t = 4; x = 5; y = 6

7. 2(x + 4) + 10 =

8. 3(6x) + 4 =

9. 10(xy) =

10. 5(x + y) =

11. 2(rs) + 4(x)

12. 2(q) + 2(x + t) =

13. 6(7t + 4s) =

14. 9(10x) + 10y =

15. 2x(xy) =

16. r(s)(t) =

17. (r)(s)(t)(x)(y) =

18. (7x + 2y) =

Answer 1

1. 3(2) + 5 = 11
2. 3(2) + 2(5) = 16
3. 3(5) + 2(2) = 19
4. 10(2) + 4(5) + 7(2) = 48
5. 8(5) + 5(2) = 50
6. 7(2) + 4(5) = 38

7. 2(5 + 4) + 10 = 28
8. 3(6*5) + 4 = 94
9. 10(5*6) = 300
10. 5(5 + 6) = 55
11. 2(2*3) + 4(5) = 26
12. 2(1) + 2(5 + 4) = 22
13. 6(7*4 + 4*3) = 264
14. 9(10*5) + 10(6) = 940
15. 2(5*6) = 60
16. 2(3)(4) = 24
17. 2(3)(4)(5)(6) = 720
18. 7(5) + 2(6) = 47

If one of them is wrong I’m sorry! But all of them should be right