SOLUTION: Can you use either elimination or substitution (both would be nice but not necessary!!!)Thank you! 5x-2y=-11 3x+2y=-9 When I tried for elimination I got: 5x-2y=-11 +

Question 882641: Can you use either elimination or substitution (both would be nice but not necessary!!!)Thank you!
5x-2y=-11
3x+2y=-9
When I tried for elimination I got:
5x-2y=-11
+ 3x+2y=-9
____________
8x=-20
x=-5/2
Then I substituted -5/2 for 'x' in the first equation;
5(-5/2)+2y=-11
-25/2+2y=-11
2y=3/2
y=3/4
but when I tried with substitution I got:
2y=11+5x
y=11/2+5/2
y=16
It would be lovely if you could help me with this!!
Thank you again and best of luck!!!
-Kristie
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
You can use substitution only; elimination only; or a mix of elimination and substitution. You will have the same correct solution regardless which method you use.

Your given system:
5x-2y=-11
3x+2y=-9
Perfectly ready for Elimination Method to start, to eliminate y.

Just sum the left members and sum the right members:

-
Substitute this x for either equation of the system to find the value for y.

-

CHECK: Does the solution work in the original system?
5x-2y=-11
?

TRUE.

3x+2y=-9
?
-15/2-6/4=-9
-30/4-6/4=-9
TRUE.

The solution really IS AND .

If you found disagreements about your results, check for mistakes.
(You made a sign mistake......)
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