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Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

Me its important ! marge runs an ice cream parlor. her speciality is triple chocolate sundaes.she can prepare 1 sundae every 2 minutes, and she earns $1.20 for each sundae she makes . if she just makes sundaes for a single shift of at most 4 hours and at least 2 hours , which function relates her earnings to the number of minutes she works?