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Mathematics 18 Online
OpenStudy (anonymous):

use the elimination method to solve the system of equations. x+8y=20 -x+5y=6

OpenStudy (mertsj):

Do you see that if you add the two equations, x will be eliminated?

OpenStudy (anonymous):

13y=26 @ybarrap

OpenStudy (mertsj):

yes

OpenStudy (mertsj):

Now divide both sides by 13

OpenStudy (anonymous):

2

OpenStudy (ybarrap):

yes, that's right

OpenStudy (mertsj):

y=2

OpenStudy (anonymous):

ok

OpenStudy (mertsj):

Now take the first equation and replace y with 2 and solve for x

OpenStudy (anonymous):

x+8(2)=20... x+16=20 so is it 4

OpenStudy (anonymous):

@ybarrap

OpenStudy (ybarrap):

yes, that is perfect

OpenStudy (ybarrap):

Be sure to test your solutions.

OpenStudy (anonymous):

so 1,4 r the solution set

OpenStudy (anonymous):

@ybarrap

OpenStudy (ybarrap):

2,4

OpenStudy (ybarrap):

actually 4,2

OpenStudy (ybarrap):

I just tested and made the correction, you should test also

OpenStudy (anonymous):

how

OpenStudy (anonymous):

@ybarrap

OpenStudy (ybarrap):

plug your solutions into the 1st equation, you will see if they are right or not. you can also use the second equation, whichever you prefer, use both in this case since it's not that hard

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