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19-01-2015
Mathematics

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y=x-2
x=17-4y
the substitution method

Respuesta :

19-01-2015

[tex] \left \{ {{y=x-2} \atop {x=17-4y}} \right. \\\\ substitute\ y=x-2\ to\ second\ equation\\\\ x=17-4(x-2)\\\\ x=17-4x+8\\\\ x=25-4x\ \ \ | add\ 4x\\\\ 5x=25\ \ \ | divide\ by\ 5\\\\ x=5\\\\ y=x-2=5-2=3[/tex]

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