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09-12-2014
Mathematics

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how do you solve this 8x+y=-16 , -3x+y=-5 using elimination

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09-12-2014

[tex] \left \{ {{8x+y=-16} \atop {-3x+y=-5\ |\cdot-1}} \right. \\\\ \left \{ {{8x+y=-16} \atop {3x-y=5}} \right. \\+-----\\\\11x=-11\ \ \ \ |:11\\x=-1\\\\8\cdot(-1)+y=-16\\-8+y=-16\\y=-16+8\\y=-8\\\\ \left \{ {{y=-8} \atop {x=-1}} \right. [/tex]

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