In the xy-coordinate system, line k has y-intercept 12 and an x-intercept greater than zero. If the area of the triangular region enclosed by line k and the two axes is 30, what is the slope of line k?
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A$$-\frac{12}{5}$$
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B$$-\frac{6}{5}$$
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C$$\frac{6}{5}$$
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D$$\frac{3}{2}$$
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E$$\frac{12}{5}$$
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正确答案: A