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Q2. a. Solve following system of equations which model the currents flowing in an electrical network:

1.5i₁ + i₂ - 1.5i₃ = 2

1.4i₁ - 0.7i₂ + 4.2i₃ = - 0.7

1.3i₁ + 3.9i₂ + 2.6i₃ = 20.8 (10)

b. Express the following as a single algebraic fraction in its simplest form: (10)

(a² - b²)/(2a - b) × (2a² + ab - b²)/(a² + 2ab + b² )