6х + у = 4
у = 4 - 6х
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ху + 9х = 2
х( 4 - 6х ) + 9х - 2 = 0
4х - 6х^2 + 9х - 2 = 0
6х^2 - 13х + 2 = 0
D = 169 - 48 = 121 = 11^2
X1 = ( 13 + 11 ) : 12 = 2
Х2 = ( 13 - 11 ) : 12 = 1/6
у1 = 4 - 6•2 = - 8
y2 = 4 - 6•( 1/6 ) = 3
Ответ ( 2 ; - 8 ) ; ( 1/6 ; 3 )