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3/-6 = -k/2 = -2/4
-1/2 = -k/2 -------------> k = 1
2)
3x-y = 1
2x+y = 9
resolviendo las ecuaciones, tenemos:
3x -y +2x + y = 1+9
5x = 10 -------> x = 2
entonces:
3x -y = 1
3*2 - y = 1 ----------> y = 5