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13-01-2015
Mathematics

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how do you do x=2y+3
2x-3y=4

Respuesta :

13-01-2015

[tex] \left \{ {{x=2y+3} \atop {2x-3y=4}} \right. \\\\2(2y+3)-3y=4\\4y+6-3y=4\\4y-3y=4-6\\y=-2\\\\x=2\cdot(-2)+3\\x=-4+3\\x=-1\\\\ \left \{ {{y=-2} \atop {x=-1}} \right. [/tex]

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