What is the value of k? answer fast! worth 99 points

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]

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

Which of the following transformations will always produce a congruent figure?