3. Solve the following set of algebraic equations: x1+x2+5x3 - x4 = 11 2x12x2+x3 + 3x4 = 3 - x1 x2+2x3 - 4x4 = 10 x2+3x3 + x4 = by expressing them in the form Ax = b and using ERO. fo 4