The highest is 7 degrees and lowest is -8 so subtract and you get a difference of 15 degrees
Point slope form is y-(-4) = 1/2(x-(-2)
y+4 =1/2 (x+2)
now the standard form 2y+8=x+2
so -x+2y=-6 is the equation for line p in standard form
It would be .75x=25-13
So .75x=12
x=16 because .75×16=12