Question

Resolva o seguinte sistema para x, y: 3x + 5y = 3, -x + 2y = 10

Answer 1

 3x + 5y = 3
 -x + 2y = 10(3)


   3x + 5y = 3
 -3x + 6y = 30
         11y = 33 ==> y = 3
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- x + 2y = 10 ==> x = 2y - 10 ==> x = 2.3 - 10 ==> x = 6 - 10 ==> x = - 4