resolver os sistemas no universo U=R²
a) 1/x + 1/y = 8 e 1/x - 1/y = -2
b) 1/x - 2/y = 1 e 2/x + 1/y = 9
c) 1/x + 1/y = 2 e 1/xy = 1
d) 1/x² - 9/y = 0 e 4/x + 3/y = 15
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the number of time a particular observation of your is called as frequency
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