ALGEBRA 2 CORRECTIONS!!!!!!!!!!!!!!!!!!!!!!… True or False

I have answered them, but I would like to know if I got them right. Im not that great at math, but this is really hard. Please no rude or unhelpful comments. I did do my work, I just need confirmation. Thank You!!

1) The graph of the following system yields perpendicular lines.
x + 2y = -10
-4y = 2x + 20

A. True
**B. False

2) The graph of the following system yields parallel lines.
x + 4y = 5
-3x = 12y - 13

**A. True
B. False

3) What is the solution to the following system of linear equations?
x - 2y = 1
y = -3x + 10

A. (4, -2)
B. (1, 0)
**C. (3, 1)
D. no solution

4) This is the result of multiplying these two matrices.
( I tried to recreate the chart the best I could but the all the [] in each colomn are all one big [], but since I cant make them that big I just did them like this.)

[a ---- b] [ aa + by ---- aB + bS]
[c ---- d] * [a ---- B] = [ ca + dy ---- cB + dS]
[e ---- f] [y ---- S] [ ea + fy ---- eB + fS]

A. True
**B. False

5) Solve the following system using substitution.
x + y = -3
y = -3x - 9

A. (4, -2)
B. (-3, 0)
**C. no solution
D. infinitely many solutions

6) The graph of the following system yields parallel lines.
2y = -10 + x
-4y = 2x + 20

A. True
**B. False

7) The graph of the following system yields parallel lines.
x - 2y = 1
y = -3x + 10

A. True
**B. False

8) What is the result of adding the two equations?
2x + 3y = -5
7x - 3y = 9

A. -5x = -14
B. 9x = 4
C. 5x = 4
**D. 9x = 14

9) What is the result of adding the two equations?
4x + y = 7
x - y = -2

A. 5x = -9
B. 3x = 5
C. 5x = 5
** D. 4x = -5

8 = B
9 = C

Rest are right