Answer:
(4, 0)
Step-by-step explanation:

x=4 when y=0, and in x-intercepts, we are trying to find the value of x when y=0, which is why (4, 0) is the point of interception.
It would be 60. He sold his painting for 50 which was 10 less that the original price. So 50+10=60
Parallel lines have the same slope so you use the 8 from the equation and plug in with your points to point slope form equation