35,000 ft - 6,000 ft = 29,000 ft
Isolate x by adding 8 to both sides.
3 = x/3
Then, multiply by 3 on both sides.
9 = x
To prove that this is right, you can imput 9 into the equation and it equals -5.
I think the answer is B it would be a vertical line with the rise/run for finding slope