If a+b+c=-9 and x+y=8, then what is -4a+6x-4c+6y-4b?

-4a+6x-4c+6y-4b

-4a -4b -4c +6x+6y

factor out 4 from the a b c terms and 6 from the x y terms

-4(a+b+c) + 6(c+y)

a+b+c = -9 so replace a+b+c with -9 and x+y = 8 so replace x+y with 8

-4(-9) +6(8)

36 +48

84

$12. that is my answer.