Ответ:

[tex]\left \{ {{4x-3y=67} \atop {7x+3y=43}} \right.[/tex]

11x=110

x=110 : 11

x=10

[tex]\left \{ {{x=10} \atop {7*10+3y=43}} \right.[/tex]

7*10+3y=43

70+3y=43

3y=43-70

3y= -27

y= -27 : 3

y= -9

[tex]\left \{ {{x=10} \atop {y=-9}} \right.[/tex]

Ответ: (10 ; -9)