(1) Answers
y = 1/3 x - 10 . . . (1) 2x + y = 4 . . . . . (2) Putting (1) into (2) gives 2x + 1/3 x - 10 = 4 7/3 x = 4 + 10 = 14 x = (3 x 14)/7 = 3 x 2 = 6 x = 6 From (1), y = 1/3 (6) - 10 = 2 - 10 = -8 y = -8
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y = 1/3 x - 10 . . . (1) 2x + y = 4 . . . . . (2) Putting (1) into (2) gives 2x + 1/3 x - 10 = 4 7/3 x = 4 + 10 = 14 x = (3 x 14)/7 = 3 x 2 = 6 x = 6 From (1), y = 1/3 (6) - 10 = 2 - 10 = -8 y = -8