4x - 7y = 3
x - 7y = 15

Question

12-01-2015
Mathematics

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4x - 7y = 3
x - 7y = 15

Sagot :

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luana luana · Answer 1 · 2015-01-12T14:13:07-05:00

luana luana

12-01-2015

[tex] \left \{ {{4x-7y=3} \atop {x-7y=15}} \right. \\\\ \left \{ {{4x-7y=3} \atop {x=15+7y}} \right. \\\\ substitution\ method\\\\ 4*(15+7y)-7y=3\\\\ 60+28y-7y=3\\\\ 60+21y=3\ \ \ \ | subtract\ \\\\ 21y=-57\\\\ y=-\frac{57}{21}=-\frac{19}{7}\\\\ x=15+7*(-\frac{19}{7})=15-19=-4\\\\\ Solution :\ \left \{ {{y=-\frac{19}{7}} \atop {x=-4}} \right. [/tex]

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