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) =