50 48. y = 6x + 4 dan 2y = 8x + 12 49. 3y = 4x + 7 dan 4y = 5x + 10 50. x – y = 3 dan x + y = 7 51. x = y + 7 dan x + y = 5 52. 2x + 5y = – 26 dan 3x – 5y = 11 53. x – 2y = –7 dan y + 2x = – 9 54. 5x – 2y = –2 dan 7x – 3y = – 3 55. x + y = 4 dan x – y = 2 56. x + y = 7 dan x – y = 3 57. 3x + 4y = 24 dan x + 2y = 11 58. 2x + 4y = 10 dan x + y = 3 59. x – 3y = I dan 2x – 5y = 3 60. x – 3y = 7 dan 2x – 5y = 3 61. 5x – 4y = 3 dan 2x + 7y = 9 62. x – 4y = 3 dan 2x – 7y = 20 63. 2x + 5y = 4 dan 3x – 5y = 0 64. 2x + 5y = 1 dan 3x – 5y = 14 65. 2x = 7 – y dan 2x = 1 + y 66. 3x = 9 – y dan 3x = 21 + y 67. x – 2y = 5 dan 2x + y = 20 68. x – 2y = 1 dan 2x + y = 12 69. 5x + 2y = 7 dan 7x – 3y = 5 70. 5x – 2y = 11 dan 7x – 3y = 15 71. y = –100x + 400 dan y = 300x – 300 72. y = 100x + 100 dan y = 300x – 100 73. 0,1x + 0,3y = 2,4 dan 0,5x – 1,5y = 12
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