since these are similar triangles, all sides have a scale factor in order to become the other
since you are being asked for the scale factor from DEF to ABC, the equality should be like this
[tex]8x=12[/tex]solve for x
[tex]x=\frac{12}{8}=\frac{3}{2}[/tex]WHAT WOULD BE THE SCALE FACTOR THAT TAKES ABC TO DEF?
apply same procedure as before, but the initial value should be 12
[tex]\begin{gathered} 12x=8 \\ x=\frac{8}{12}=\frac{2}{3} \end{gathered}[/tex]