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Find the solution of system of equation y= x-4 y=4x+2

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents

The given dot plot represents the average daily temperatures, in degrees fahrenheit, recorded in a town during the first 15 days of september. if the dot plot is converted to a box plot, the first quartile would be drawn at __ , and the third quartile would be drawn at __ link to graph: .