(MATH 114N Week 4 Homework Section 15.2)
1.Question: Solve the following system by the substitution method. Check the solution(s).
3x + y = 15
y = 2x
2. Question: Solve the following system by the substitution method. Check the solution(s).
3x + 5y = 36
x = y + 4
3. Question: Solve the following system by the substitution method. Check the solution(s).
8y – 10x = 74
x – 3y = – 25
4. Question: Solve the following system by the substitution method. Check the solution(s).
4x + 7y = – 8
x + y = 1
5. Question: Solve the following system by the substitution method. Check the solution(s).
3x + y = 4
y = 4 – 3x
6. Question: Solve the following system by the substitution method. Check the solution(s).
2x + 4y = 2
x = 9 – 2y
7. Question: Solve the following system by the substitution method. Check the solution(s).
15x – 10y = 5
5y = – 4 + 15x
8. Question: Solve the following system by the substitution method. Check the solution(s).
x + y = –
3x – y = 12
9. Question: Solve the following system by the substitution method. Check the solution(s).
x + y = –
x + 2y = 11
10. Question: Solve the following system by the substitution method. Check the solution(s).
0.1x + 0.7y = – 1.7
0.5x – 0.6y = 3.8
11. Question: Solve the following system by the substitution method. Check the solution(s).
0.04x + 0.01y = 0.7
0.27x + 0.16y = 16.1
12. Question: Solve the following system by the substitution method. Check the solution(s).
3x + 2 = – y
2x + y = 0
13. Question: Solve the following system by the substitution method. Check the solution(s).
3x + y = 2
y = 2 – 3x
14. Question: Solve the following system by the substitution method. Check the solution(s).
4x + 5y = 46
