We look for a number that multiplying it by 5 gives us 10 to preserve scale and find it
[tex]\begin{gathered} 5\times y=10 \\ y=2 \end{gathered}[/tex]so, the scale is 2
to find the value of x we just apply the sacale to 8
[tex]8\times2=16[/tex]so, the value of x is 16
