$$\left. \begin{array} { l } { 1 } \\ { x = 3.5 } \\ { \quad f ( x ) = 7 x - 1 } \end{array} \right.$$
$y=1$
$$f\times 3.5=7\times 3.5-1$$
$$f\times 3.5=24.5-1$$
$$f\times 3.5=23.5$$
$$f=\frac{23.5}{3.5}$$
$$f=\frac{235}{35}$$
$$f=\frac{47}{7}$$
$$x=3.5$$ $$f=\frac{47}{7}$$ $$y=1$$
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