Answer:

Step-by-step explanation:
So we have the equation:

Subtract 7 from both sides:

Divide both sides by 3:

So, the value of w is 4.
And we're done!
Answer:
Each friend will get 35 markers
Step-by-step explanation:
525 / 15 = 35
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.