Is this answer are right, number 1 and question #2

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

What is the surface area of the sphere?

What is the solution for the following system of equations? use any method to solve. 2x + 8y = 4 x = -3y + 5 question 4 options: x = 14, y= -3 x = 2, y = -3 x = -3, y = -3 x = 12, y = 5