Срочно помогите пожалуйста только 2 и 3

2) x=6-3y 4(6-3y)-9y=3 24-12y-9y=3 -21y=3-24 -21y=-21 y=1 x=6-3*1=3 Ответ: (3; 1). 3) x+(-x)+y+y=49+17 2y=66 y=66 : 2 y=33 x+33=49 x=49-33 x=16 Ответ: (16; 33).

2) [latex] \left \{ {4x - 9 = 3 } \atop {x + 3y = 6}} \right. [/latex] [latex] \left \{ {{4(6 - 3y) - 9y = 3} \atop {x= 6 - 3y}} \right. [/latex] [latex] \left \{ {-12y - 9y = -24 +3} \atop {x=6 - 3y}} \right. [/latex] [latex] \left \{ {{-21y = -21 \ :(-21)} \atop {x= 6 - 3y}} \right. [/latex] [latex] \left \{ {{y=1} \atop {x=6 - 3*1 = 3}} \right. [/latex] 3) [latex] \left \{ {{x + y = 49} \atop { -x + y = 17}} \right. [/latex] (+ и - ) между ними [latex] \left \{ {{2y = 66 \:2} \atop { 2x = 32\:2}} \right. [/latex] [latex] \left \{ {{y = 33} \atop { x = 16}} \right. [/latex]