<span>6x-4y=10
6x=10+4y
x=10/6 +4/6 y
x=5/3+2/3 y
x=5/3 +2/3 y
</span><span>11+3y=39
3y=39-11
3y=28
y=28/3
y=9 1/3 =9.3333
</span>
5х(3у-1)+6(3у-1)
5х+6 (3у+1)(3у-1)
5х+6у (9у^2-1)
х= -0,9
у= 1 1/3= 4/3
5(-0,9)+6 (9 (4/3)^2 -1)=
-4,5+6 (16-1)= -4,5+96-6=
85,5
A²-10a+3a-30-(a²-4a+7a-28)=a²-10a+3a-30-a²+4a-7a+28= -10a-2= 0.1-2= -1.9
<span>8-x>=9x-6
8+6>=9x+x
14>=10x
14:10>=x
1,4>=x</span>