Part a.
In this case, we need to substitute the given point values into the expression x-2y. Then for point (7,3), we have
[tex]\begin{gathered} 7-2(3) \\ \text{which gives} \\ 7-6=1 \end{gathered}[/tex]
Now, for point (7,5) we have
[tex]\begin{gathered} 7-2(5) \\ \text{which gives} \\ 7-10=-3 \end{gathered}[/tex]
Part b.
As we can note, in the first case we got 1 which is 2 units from 3. In the second case, we got -3, which is 6 units from 3. Therefore, point (7,3) gives the closest value to 3
