Elimination System of equation?

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Tory11ful

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Answers; 1.x+y=4 x-y=16 Minus eq 1 frm 2 -2y=12. y=6 Substitute y=6 in eq 1 x=-2. 2. Minus eq 2 frm 1 6y=12 y=2.Substitute y=2 in eq 1 x=-3 3.Minus eq 2 frm 1 -9y=18 y=18/-9 y=-2 Substitute y=-2 in eq 1 x=-3 4..add eq 1 and 2 no answer 5.minus eq 2 frm 1 2y=-6 y=-3.Substitute y=-3 in d equation x=1/2 6.add eq 1 and 2 -x=3 x=-3 substitute it in eq 1 y=-1 7.Multiply eq 1 by 2 and eq 2 by 1 Subtract eq 1 frm 2 .2x=-26 x=-13 8.multiply eq1 by 1 and eq 2 by 4.Subtract eq 1 frm 2 4y=-40 y=-10 Substitute y=-10 in eq 1 x=-20 9. Multiply eq 1 by 2 and eq 2 by1 Add the 2 eqs 3x=12 x=4 Substitute x=4 in eq 1 y=6 This is where I can stop
 
Answers; 1.x+y=4 x-y=16 Minus eq 1 frm 2 -2y=12. y=6 Substitute y=6 in eq 1 x=-2. 2. Minus eq 2 frm 1 6y=12 y=2.Substitute y=2 in eq 1 x=-3 3.Minus eq 2 frm 1 -9y=18 y=18/-9 y=-2 Substitute y=-2 in eq 1 x=-3 4..add eq 1 and 2 no answer 5.minus eq 2 frm 1 2y=-6 y=-3.Substitute y=-3 in d equation x=1/2 6.add eq 1 and 2 -x=3 x=-3 substitute it in eq 1 y=-1 7.Multiply eq 1 by 2 and eq 2 by 1 Subtract eq 1 frm 2 .2x=-26 x=-13 8.multiply eq1 by 1 and eq 2 by 4.Subtract eq 1 frm 2 4y=-40 y=-10 Substitute y=-10 in eq 1 x=-20 9. Multiply eq 1 by 2 and eq 2 by1 Add the 2 eqs 3x=12 x=4 Substitute x=4 in eq 1 y=6 This is where I can stop
 
use elimination to solve each system of equations.
11. x + y = 4
x - y = 16

12. x + 4y = 5
x - 2y = -7

13. x - 6y = 9
x + 3y = - 9

14. -x - y = 4
x + y = - 4

15. 2x + y = - 2
2x - y = 4

16. x - 8y = 5
-2x + 8y = - 2

17. x - y = 9
4x - 2y = - 8

18. 4x - 8y = 0
x + 3y = - 10

19. x - y = - 2
2x + 2y = 16

20. 6x - 3y = 18
10x + y = -12
i need help because i dont get it oh and FYi it's not homework they are just practice preoblems.. dont assume things
anyways i got a test i need to practice for explaining 1 or 2 problems aint gonna help anybody willing to explain these problem to me??
 
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