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isolate y in the second equation , then substitute this into the first equation

Oh, so to substitute we get - 2(y - 12) = 3?

yeah that's the quickest way ,

your working looks right , but there must be a mistake somewhere

ahh you forgot one term
- 2x - y = 3 , y - 12 = x.
-2(y-12)-y=3
- 2y + 24 -y =3

Since the variables are on the same side do you add them together and get - 3y?

thats right ,

very good. now just use this to find x and your done

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Thanks for the help. So the solution is (- 5, 7)?