Answer asap

using your own words, describe how you would write the equation of a line given a point on the line and a parallel line

When you're given a parallel line, that means you know that both lines should have the same slope m.
And you're given a point (x,y) so you plug in the x for  in the equation and y for  in the equation.
Also plug in m because that was given.

y -  = m(x - )

Then you can simplify the equation to get y = mx + b

It looks like they've done the multiplication for you and added in the correct +/- signs). Just copy the numbers in the row above into the blanks

example, First two rows

 16a^5 + 4a^3 - 4a^2 + 3a - 1
 16a^5 + 4a^3 +  0   + 0  + 0 - 8a^4
-16a^5 - 4a^3 + 0    + 0  + 0 + 8a^4

                    8a^4 - 4a^2 + 3a - 1