3 i Solve the system of linear equations by graphing.
y=-x+7
y=x+1
Line
TO2P011u600r420u2T4Z9N302779MOB
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Determine the mean and variance of the random variable with the following probability mass function. f(x)=( 729divided by 91) (1 divided by 9) superscript x baseline comma x equals 1,2,3 round your answers to three decimal places (e.g. 98.765).

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