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Mathematics 12 Online
OpenStudy (anonymous):

-5x - 3y = -16 -x + 9y = 64 elimination method last one

OpenStudy (cwrw238):

multiply first equation by 3: -15x - 9y = -48 now add this to second equation to eliminate y so you can solve for x then plug value of x into first or 2 nd original equation to find y

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