Answer:

Step-by-step explanation:
We start with the equation:

We want to find the value of:

We can start with our previous equation and multiply both sides by a:

Now we can rewrite our initial expression as:

Replacing that in the right side, we get:

Now again, let's multiply both sides by a

So we can conclude that:

The easiest way is to plug x=-4, y=-1 in the equation to see which one works.
8(-4)-9(-1)=-23
B is correct.
Answer:
Step-by-step explanation:
You are counting by 10s so the answer is 40,50,60,70,80
the complete sequence: 10,20,30,40,50,60,70,80,90,100