In 9, the differences between two consecutive terms are
6-3,12-6,24-12...
3,6,12...
Which is not same. So it is not is arithmetic progression .
In 10. the differences are


Which is not same, so it is not in arithmetic progression too .
Answer:
-27x-41
Step-by-step explanation:
Answer attached.....
Hope it helps:)
Answer:
x = -1, y= -5
Step-by-step explanation:
y=-x-6
y=x-4
Since both equations are equal to y we can set them equal to each other
-x-6 = x-4
Add x to each side
-x-6+x = x-4+x
-6 = 2x-4
Add 4 to each side
-6+4 = 2x-4+4
-2 =2x
Divide by 2
-2/2 = 2x/2
-1 = x
now find y
y = x-4
y = -1-4
y = -5