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[mcode]f[x_, y_] := x^2 + y^2 == 25 Plot[f[x, y], {x, -20, 20}, {y, -20, 20}, AxesLabel -> {x, y}] Plot::nonopt: Options expected (instead of {y,-20,20}) beyond position 2 in Plot[f[x,y],{x,-20,20},{y,-20,20},AxesLabel->{x,y}]. An option must be a...