La pendiente de la recta es: \frac{4-2}{1-1}=\frac{2}{0}=\infty
Por lo tanto, la recta es una recta vertical que pasa por (1,2) y (1,4)
Por lo tanto, la ecuación es x=1
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Write a math question for the theme "Characteristics of constant function f(x)=c": Find the value of c if the constant function f(x)=c passes through the point (5, 9).
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