For this case we have that by definition, the point-slope equation of a line is given by:

Where:
m: It's the slope
It is a point through which the line passes
According to the statement data we have:

Substituting we have:

By law of signs of multiplication we have to:

Answer:
The requested equation is: 
The answers are -16 and 9. Hopefully this helps :D
1.) 7.2 2.) 15 3.)12
4.) 23 5.) 100, 100, 1000
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V = w*h*l
V = 3*8*4
V = 96 cm^3