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Algebra
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Find the sum of x and y. x-y=4 2x+y=(-4)
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You know that x = y+4. Sub y+4 into the equation 2x+y = (-4), solve for y, then plug it back in to find x.
Math isn't my best subject at all. How do I solve for y?
For two variables with two equations, solving them simultaneously is much easier than trying to solve by substitution method.
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