Даны уравнения двух прямых: -2x-7y+1=0 и 3x+4y+5=0

[tex] \left \{ {{-2x-7y+1=0} \atop {3x+4y+5=0}} \right. \; \left \{ {{2x+7y=1|\cdot (-3)} \atop {3x+4y=-5|\cdot 2}} \right. \; \left \{ {{2x+7y=1} \atop {-13y=-13}} \right. \; \left \{ {{2x+7\cdot 1=1} \atop {y=1}} \right. \; \left \{ {{x=-3} \atop {y=1}} \right. [/tex]

[tex]x_0+y_0=-3+1=-2[/tex]