This really depends on the fraction; if there are variables in the equation, if they are full numbers,etc. I'd really recommend looking up khan academy on YouTube and that will really help you out!
BA can be another name for AB
Well 1000 for his birthday then subtract 25 each week, w, should be 1000-25w if i am not mistaken.
Using slope formula, the slope will be 1/6
Replace y in the second equation with the value of Y from the first equation:
-x - 3 = 5
Add 3 to both sides:
-x = 8
Multiply both sides by -1:
x = -8
The answer is:
(-8,3)