Factor out the 4 in both equations 8a^2-20^2=(2^2 times a^2 times 2)-(2^2 times 5) therefor it is also equal to (2a)^2 times 2-(2^2 times 5) we can force it into a difference of 2 perfect squares which is a^2-b^2=(a-b)(a+b) (2a√2)^2-(2√5)^2=((2a√2)-(2√5))((2a√2)+(2√5))
So to get the answer you do 100100100+303030-101010 which = 100302120 x 10 (the amount she/he gets for each subscriber) which is the amount of money Kiersten earned.
Since the second line is parallel to the first, it will have the same slope. The y-intercept of the new line is 4 (because of the coordinates given) so the equation of Lynda's second cut is y = 1/4x + 4 which is choice C
