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Mathematics, 09.02.2021 23:20 jdkrisdaimcc11

Which of these functions is not a linear function? Why? f(x)=x-x
f(x)=3x
f(x)=x3
f(x)=23x-2
how am i supposed to know-

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Which of these functions is not a linear function? Why? f(x)=x-x
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f(x)=x3
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