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write and solve a revised system
-5x-2y=6
3x+6y=6

Sagot :

luana
[tex] \left \{ {{-5x-2y=6\ \ | *3} \atop {3x+6y=6}} \right. \\\\ \left \{ {{-15x-6y=18} \atop {3x+6y=6}} \right. \\+----\\addition\\\\ -12x=24 \ \ \ \ | divide\ by\ -12\\\\ x=-2\\\\ 2y=-5x-6\ \ \ | divide\ by\ 2\\\\ y=\frac{-5x-6}{2}\\\\ y=\frac{-5*(-2)-6}{2}=\frac{4}{2}=2[/tex]
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