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add both equations

you'll get 2x = 22

solve for that, and you'll get 11

I though that too, but that's not an answer. :(

thought*

what are the options?

-22
-12
-2

I have to go, I'll respond to this in a little bit. Sorry.

x + y = 12
x - y = 10
D = (1)(-1)-(1)(1)
Dx = (12)(-1)-(10)(1)
Dy = (1)(10)-(1)(12)

That's fine. Thanks though :)

( or her work, I didn't see who it was)

Yes, that is the only one have and that I understand.

the products of those would be -12 and -10, right?

Right, and that adds up to -22.
Thus, your x is found in this manner:|dw:1396530623039:dw|

10?

close. Try again.

and your y value is

I meant 11, oops :p

y value is 1? I think

|dw:1396530712310:dw|

Cool. Yes, y=1. Solution is (11,1). congrats!

I don't understand because the answers are only -22,-12, and -2. This is what confuses me

Is it asking for another part of the question? I'm unsure.

that's right!! they are both modifications of the system determinant.

That's like music to the ears! :)