Question

Решите систему
-3х+у=-7 и -4х+6у=1

Answer 1

{-3x+y=-7/*(-6)⇒18x-6y=42
{-4x+6y=1
прибавим
14x=41
x=41/14
y=-7+3*41/14=(-98+123)/14-25/14
(41/14;25/14)