2x - y = -1
3x + 5y = 18

what are the order pairs to these equations.

2x - y = -1    (1)
3x + 5y = 18 (2)
=> 6x - 3y =-3
     6x +10y =36
=> -13y = -39 => y =3
Substitute y into the equation (1)
2x -3 = -1 => 2x =2 => x=1
so the oder pairs to these equations is : { 1:3 }