Required Equation is 
Given: A line passing through
and 
Slope =
= 
Equation of line is:

Where b is y intercept
for value of b

⇒ b = -1
and Equation of line is:

For another parallel line that passes through the point (-3,0)


c = 2
then the equation is:

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im pretty sure it is 4.18x10^13
-18 i dont really know but
yes you are right, density formula is :
density = mass ÷ vol