An equation of a line has the next general form:
[tex]y=mx+b[/tex]Then, from the given equations the one that has a graph that is a straight line is:
[tex]y=12x+17[/tex]----------------------------------
A linear function have a proportional relationship between its variables.
Then, you need to find the relation in the given data:
[tex]\begin{gathered} \frac{y_2-y_1}{x_2-x_1} \\ \\ \frac{9-12}{3-1}=-\frac{3}{2} \\ \\ \frac{6-9}{5-3}=-\frac{3}{2} \end{gathered}[/tex]The constant of proportionality is -3/2, then ordered pair that can be placed in the table needs to follow that constant:
[tex]\begin{gathered} (7,3) \\ \frac{3-6}{7-5}=-\frac{3}{2} \end{gathered}[/tex]The point is (7,3)