Answer:
16.2
Step-by-step explanation:
add all the numbers together and divide by the amount of numbers
10.5 and 8.4 ......................,,,,,
Answer:

graph:
find -18, and draw an arrow going right
Y= -2x-5
Work:
8x+4y=-20
4y=-20-8x
y= -2x-5
First step is distribution:
-(6-5n)+12
-6+5n+12
5n+6=-6+5n+15
Second step combine like terms:
5n+6=5n+9
-6 -6
5n=5n+3
0=3