Solve the system of linear equations by substitution. 2x+3y=4 y+3x=6

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The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.