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2X - Y = 4 (1)
2X - 3Y = 9 (2)
2X - 4 = Y (1)
2X - 9 = 3Y
Y = (2/3)X - 3 (2)
b)
5X + 6Y = 9 (1)
X + Y = 5 (2)
6Y = 9 - 5X
Y = (9/6) - (5/6)X
Y = 3/2 - (5/6)X (1)
X + Y = 5
Y = 5 - X (2)
Te anexo las graficas