substitute (1,p)
Hello, Ilsa!
. . . . .
Substitute into [1]: .
Substitute into [2]: .
. . . . . . . . . . . . . .
. . One solution is
The two equations become: .
Substitute [4] into [3]: .
. . which simplifies to: .
. . which factors: .
. . and has roots: .
Substitute into [4]: .
The solutions are: .