x − 7y = 20 x + 12y = −1 find the value for y

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x − 7y = 20 x + 12y = −1 find the value for y

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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Hi marmar, so do you know the substitution method?
Basically we're looking to build an equation that only has one variable
\[x - 7y = 20\] becomes: \[x = 20 + 7y\]

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So can you write your second equation using this value for x?
That is one way you could multiply your first equation by -1 and then add the equations.
Good point myin - that's probably easier here huh?
Maybe they like your better.
I ALWAYS think in terms of substitution - to a fault ;)
wow two moderators on one problem!
Do you prefer substitution or elimination @ marmar? (
Ha satellite - two moderators, a resident expert, and no question asker...

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