Find the constant of variation k for the direct variation x -1 0 2 5 f(x) 2 0 -4 -10

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

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This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.