Answer:
y = -2x+8
Step-by-step explanation:
We have 2 points so we can find the slope
m = (y2-y1)/x2-x1)
m = ( -4 -8)/(6 - 0)
= -12/6
= -2
The y intercept is 8 from the point (0,8)
The slope intercept form is
y = mx+b where m is the slope and b is the y intercept
y = -2x+8
Given the equation
.
When x is maximum, we have
. Hence 
The maximum temperature is 
When x is minimum, we have
. Hence 
The minimum temperature is 
12x40=480
You can first multiply 12x4=48 and then you could put a zero next to the 8