# SOLUTION: Having trouble with systems of equations using elimination. y=2x+3 and y=-x-4

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 Click here to see ALL problems on Human-and-algebraic-language Question 295047: Having trouble with systems of equations using elimination. y=2x+3 and y=-x-4Found 2 solutions by richwmiller, ozybloke:Answer by richwmiller(9135)   (Show Source): You can put this solution on YOUR website!They are both equal to y. Set them equal to each other. 2x+3=-x-4 3x=-7 x=-7/3 y=7/3-4 y=7/3-12/3 y=-5/3 or we could y=2x+3 and y=-x-4 subtract the second from the first 0=3x+7 -7=3x -7/3=x That looks familiar. Answer by ozybloke(7)   (Show Source): You can put this solution on YOUR website!y = 2x + 3 y = -x - 4 Use the substitution method If y = 2x + 3 then replace the y in the second equation with 2x + 3 2x + 3 = -x - 4 Collect like terms 3x = - 7 x = -7/3 If x = -7/3 then substitute that value in to the top equation to find y y = 2(-7/3) + 3 y = -14/3 + 9/3 y = - 5/3