Y=4x+9 is not a direct variation an example of a direct variation is y=2x
Take original price and multiply by .75. (An item that has been discounted 25% is 75% of the original price.) the number you get will be the sale price.
You can subtract both sides by w then you are left with 3 = 6, which is false equation.
So there is no solution.
Hope this helps.
Distance A to B: Yes
distance A to C: No
distance B to F: Yes
distance C to D: No
distance E to A: Yes