Answer :
[tex]\begin{gathered} \text{The given diagram is a parallelogram,} \\ so,\text{ the length of diagonal will be equal.} \\ \text{The 1st diagonal is}\Rightarrow2x=y \\ \text{The 2nd diagonal is}\Rightarrow y+4=3x \\ Substitute\text{ the y=2x in the second diagonal equation} \\ 2x+4=3x \\ x=4 \\ \text{Now, x=4 in the first diagonal equation} \\ y=2\times4=8 \\ So,\text{ the variable are} \\ x=4 \\ y=8 \end{gathered}[/tex]