W = -6
You get the formula from (8, -10) and the slope.
Find out how old her dad was when Cindy was born by subtracting 2 from 28. Her dad was 26 when she was born. If Cindy is 18 then her dad is 26 years older than that. 18+26=dads age. Dads age is 44.
-34.44 +49.44 = 15
The highest recorded temperature was 15 degrees.