1) 6x-8y=6*2/3-8*5/8 = 4-5 = -1;
2) -0,8x-1 = -0,8*6-1 = -4,8-1 = -5,8;
0,8x-1 = 0,8*6-1 = 4,8-1 = 3,8;
-0,8x-1 < 0,8x-1 при x = 6;
3) 2x-3y-11x+8y = -9x+5y;
4) 5(2a+1)-3 = 10a+5-3 = 10a+2;
5) 14x-(x-1)+(2x+6)=14x-x+1+2x+6=15x+7.
1) 6x-8y=6*2/3-8*5/8 = 4-5 = -1;
2) -0,8x-1 = -0,8*6-1 = -4,8-1 = -5,8;
0,8x-1 = 0,8*6-1 = 4,8-1 = 3,8;
-0,8x-1 < 0,8x-1 при x = 6;
3) 2x-3y-11x+8y = -9x+5y;
4) 5(2a+1)-3 = 10a+5-3 = 10a+2;
5) 14x-(x-1)+(2x+6)=14x-x+1+2x+6=15x+7.