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Question 2 (a) Solve the following system of linear equations by using the method of substitution. x+3y=-11 3x+2y=30 [4 marks] (b) Solve the following system of linear equations by using the method of elimination. 3x+2y+9=0 4 x=3 y+5 [5 marks] (c) Solve the following equations by using Gaussian elimination. x+ y - z = 4 x - 2y+2z =-5 (i) 2x - y + 2z = - 2 18 marks] x+3y - z= 2x+z = 7 (ii) x - 2y+3z =13 [8 marks]