What is an equation of the line that passes through the points (
4
,
8
)
(4,8) and
(
−
2
,
−
7
)
(−2,−7)?

Horizontal change or the change of x

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.

3you can not round up to four, as there was not a full payment for the fourth night, so uou would round down to 3