Help please this is timed

The ksp expression for the system pbcl2(s) pb+2(aq) + 2 cl-(aq) is: [pbc12][pb+2][2cl-] [pb+2][cl-]2 [pb+2][2cl-]2 [pbcl2][pb+2][cl-]2 [pb+2][2cl-]2[pbcl2]

The larger of two number is 4 less than twice the smaller number. the sum is 41. find the numbers

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15