Answer:
c
Step-by-step explanation:
-a+-2b+4c
Combine like terms
-4a+ 3a= -a
b+ -3b= -2b
3c+ c= 4c
30 and 13
x-y=17 and x+y=43
x=17+y and x=43-y, so 17+y=43-y
so y=13
43-13=30, so x=30 and y=13
y=-5
1. 3a2
