How do I solve for x

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

Complete each statement from the information given and the triangle criterion you used. if the triangles cannot be shown to be congruent, leave the box for the second triangle blank and choose for reason “cannot be determined.” carbon - regular hexagon. ∆can ≅ ∆ by

Angle that produces maximum distance