{y, x} = { 11, -3}
Substitution :
// Solve equation [2] for the variable y
[2] y = 2x - 5
// Plug this in for variable y in equation [1]
[1] (2x-5) - 3x = -2
[1] - x = 3
// Solve equation [1] for the variable x
[1] x = - 3
// By now we know this much :
y = 2x-5
x = -3
// Use the x value to solve for y
y = 2(-3)-5 = -11
