If the temperature in frostburg is 18 less than the temperature in coldspot, then the following equation compares the two temperatures:

where
are the temperatures in frostburg and coldspot. Since we're given
, we can solve for
:

Answer: 1/3
Step-by-step explanation: The slope goes up 1 and over 3 each time. Rise over run : 1/3
The answer is 13.
To solve this question, you need to determine the slope of the function. if howl is y and the temperature is x of the graph, the slope would be:
9-5/(40-70)= 4/-30= -2/15
Using one of the point and the slope, you can find the number of howl
-2/15= 9-y/40-(-20)
9-y= -2/15 * 60
9-y= -4
y= 9+4= 13
That is Slope Form. They should give you two coordinates and you substitute them in.
"a ∝ b" means "a is proportional to b", which in turn means there is some constant k such that
a = kb
We're given that a = 18 and b = 3, so that
18 = 3k ⇒ k = 6
Then when b = 5, we would have
a = 6 × 5 = 30