Solve the following system of simultaneous equations to find the values of x₁and x₂:
5x₁ - 7x₂ = -18
4x₁ + 3x₂ = 20
2. Solve the following system of simultaneous equations to find the values of X1 and X2:
16x₁ + 12x₂ = 450
(0.5x₁ + 1.4x₂ = 25
3. Identify the feasible region for the following constraint: (please provide the constraint you would like to identify the feasible region for)