a=2quad b=3quad c=6quad y=-3quad z=0 -2a-4b= a+3b-(1)/(2)c+y= -6c-2y+6z= 8a+2b-4y=

1.-202.03.04.16

1. -2a-4b= -2(2)-4(3) = -4 - 12 = -16 2. a+3b-1/2c+y= 2+3(3)-(1/2)(6)-3 = 2+9-3-3= 0 3. -6c-2y+6z= -6(6)-2(-3)+6(0) = -36 + 6 + 0 = -30 + 6 = -244. 8a+2b-4y= 8(2) + 2(3) - 4(-3) = 16 + 6 + 12 = 34.