X^2 + 7X = - 6
X^2 + 7X + 6 = 0
D = 49 - 24 = 25 ; √ D = 5
X1 = ( - 7 + 5 ) : 2 = ( - 1 )
X2 = ( - 12 ) : 2 = ( - 6 )
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3Y = - 1 - 7X
3Y1 = - 1 + 7 = 6 ---> Y1 = 2
3Y2 = - 1 + 42 = 41 ---> Y2 = 41/3 = 13 2/3
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Ответ ( - 1 ; 2 ) ; ( - 6 ; 13 2/3 )