Quick math help

Can someone check my answers on these? Thank you!!
Solve each system using addition or subtraction.

1. x+y=8
x-y=4
For the solution I got (6,3)
2. x-3y=7
x+2y=2
For the solution I got (4,-1)
3. 5s+2t=6
9s+2t=22
For the solution I got (-4,13)
4. 2x+3y=13
x-3y=2
For the solution I got (5,1)
5. 2m-5n=-6
2m-7n=-14
I got (7,-4)
6. 3r-5s=-35
2r-5s=-30
I need help on this one!!!

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