Pls hurry I’m being timed

Select the correct answer from the drop-down menu. subtracting 3xy^2 from 8xy^2 gives the same result as the expression. [tex]3xy ^{2} - 8xy ^{2} [/tex][tex] { - 7xy}^{2} - {2xy}^{2} [/tex][tex] {7xy}^{2} - {2xy}^{2} [/tex]

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?

Y= a(x-3)squared-1 what is the value of a