09-04-2015
Mathematics

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how do I solve 4x+y=0 and 5x-y=9

Respuesta :

09-04-2015

[tex] \left \{ {{4x+Y=0} \atop {5x-Y=9}} \right. [/tex]
[tex](4x+y=0) + (5x-y=9) \\ 9x+y-y=0+9 \\ 9x=9[/tex]
[tex] x=1[/tex]
[tex]4(1)+y=0[/tex]
[tex]y=-4[/tex]

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