Можете дать сылку если найдете Решите систему уравнений методом подстановки. 1) у=-3х , 5х+3у=12 2) х=2у+5 , 2х+3у=-4 3) у=-8х , 2х+0,5у=1 4) -х-4у=-5 , 2х+7у=8 5) х=5у , 2х...

1) [latex] \left \{ {{y=-3x} \atop {5x+3y=12}} \right. [/latex] 5x+3(-3x)=12 5x-9x=12 -4x=12 x= 12:(-4) x= -3 2) [latex] \left \{ {{x=2y+5} \atop {2x+3y=-4}} \right. [/latex] 2(2y+5)+3y= -4 4y+10+3y = -4 7y+10= -4 7y=-14 y= -2 3)[latex] \left \{ {{y=-8x} \atop {2x+0.5y=1}} \right. [/latex] 2x+0.5(-8x)=1 2x-4x=1 -2x=1 x= -0.5 4) [latex] \left \{ {{-x-4y=-5} \atop {2x+7y=8}} \right. =\ \textgreater \ \left \{ {{x=5+4y} \atop {2(5-4y)+7y=8}} \right. [/latex] 2(5-4y)+7y=8 10-8y+7y=8 10-y=8 -y=-2 y=2 5) [latex] \left \{ {{y=5y} \atop {2x-7y=6 }} \right. [/latex] 2*5y-7y=6 10y-7y=6 3y=6 y=2 6) [latex] \left \{ {{y=2-3x} \atop {5x+4y=-6}} \right. [/latex] 5x+4(2-3x)= -6 5x+8-12x= -6 -7x=-14 x= 2 7)[latex] \left \{ {{x=3.5y} \atop {4x-3y=22}} \right. [/latex] 4(3.5y)-3y=22 14y-3y=22 11y=22 y=2 8)[latex] \left \{ {6x-y=4} \atop {3x+5y=13}} \right. =\ \textgreater \ \left \{ {{y=6x-4} \atop {3x+5(6x-4)=13}} \right. [/latex] 3x+5(6x-4)=13 3x+30x-20=13 33x-20=13 33x=33 x=1