y-intercept is 6 - (-1) = 6 + 1 = 7
See attached work:
Two and four will work. Just plug in the numbers to see
To set the equation,we can first find how much price would be raised within a year:
=500×(1+7%)
=500×1.07
As the years go by the increase would accumulate,and the equation would be:

Hope it helps!
Let A= the sky is red at night
let B= the weather will be nice the next day
Since this is based on Conditional Probability,
P(B|A)
This is read: The probability that the weather iss nice the next day GIVEN the sky is red at night.