A) 3x + 3y = 27 ----- (1) x - 3y = -11-------(2) Multiplying (2) by 3 we have 3x - 9y = -33 ----(3) Subtracting (3) from (1) we have -9y - 3y = -33 - 27 So y = 5. Substituting value of y into (1) we have 3x + 3(5) = 27. So x = 27 - 15/ 3 = 4. B) Also 2x + 4y= 22 ----(1) 2x - 2y= -8 -----(2) Subtracting (2) from (1) we have -2y - 4y = -8 - 22 = -30 -6y = - 30. Hence y = 5. Substituting into (1) we have 2x + 4(5) = 22. X = 22 - 20/2 = 1 C) 5x - y = 0 -------(1) 3x + y = 24 ------(2) Adding (2) to (1) we have 3x + 5x = 24. X = 24/8 = 3. So y = 5(3) - y = 0. y = 15
