1C
2A
3A
4D
5C
6D
7D
8C
9D
10B
11D
12D
13C
14B
15A
16C
17A
18C
19A
Short answers:
1) (34,39) satisfies the system when you plug them in.
2)(-5,-8)
3) x=-55   y=-18
4) m=-3   n=11
5) one solution
6a) k=2  b) k not equal 2  c) No solution means same slope, different y intercept. Not possible since their y-intercepts are equal.
Problems:
1) (-3,2)
2) infinite solutions