Mathematics, 22.08.2019 15:00 alexmarto8467

Ihave this weird question that has to do with linear equations (i think), and this is what it says. let f(x) = 4x - 5 a. find f(3) b. find x when f(x) = -21 can somebody me understand this ? ?

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Ihave this weird question that has to do with linear equations (i think), and this is what it says....