Помогите решить систему уравнений [latex] \left \{ {{3x-2y=13} \atop {x+4y=-19}} \right. [/latex] И помогите решить систему неравенств[latex] \left \{ {x+7\ \textless \ 11} \atop {-3x \leq 7}} \right. [/latex]

[latex] \left \{ {{3x - 2y=13} \atop {x+4y=-19}} \right. +\left \{ {{3x-2y=13|*2} \atop {x+4y=-19}} \right. 2(3x-2y) + (x+4y) = 2*13 - 19 7x = 7 x = 1 3*1-2y = 13 y = -5 (1 ; -5)[/latex] [latex] \left \{ {{x+7\ \textless \ 11} \atop {-3x \leq 7}} \right. [/latex] [latex]1) x + 7 \ \textless \ 11[/latex] [latex]x \ \textless \ 4[/latex] [latex]2) -3x \leq 7 [/latex] [latex]x \geq - 2\frac{1}{3} [/latex] ⇒ [latex]-2 \frac{1}{3} \leq x \leq 4[/latex]