[tex]\left \{ {{3(x+1) - (y-2) = 9} \atop {2x + y =6}} \right. \\\\\left \{ {{3(x+1) - (6-2x-2) = 9} \atop {y = 6 - 2x}} \right. \\\\\\left \{ {{3x+3 - 6+2x+2 = 9} \atop {y = 6 - 2x}} \right. \\\\\\\left \{ {{5x = 9 - 3 + 6 - 2} \atop {y = 6 - 2x}} \right. \\\\\\\left \{ {{5x = 10} \atop {y = 6 - 2x}} \right. \\\\\\\\\left \{ {{x = 2} \atop {y = 2}} \right. \\\\[/tex]
Sprawdzenie:
3*3 - 2 - 2 = 9
9 = 9
2*2 + 2 = 6
6 = 6
