B is the answer because you are subtracting 2 each time. Arithmetic sequences are either subtraction or addition
Answer:
There is only one solution and the solution is (0,4).
Step-by-step explanation:
The given system has equations;

and

We equate the two equations to determine their point of intersection;




We put x=0 into the first equation to get;

There is only one solution and the solution is (0,4).
If these are number systems then it will turn out like this 
<span>7x+9=2(4x+2)
7x+9=8x+4
7x-8x=4-9
-x=-5
x=-5/-x
x=5
</span>