Use Cramer's rule to solve for xxx in the system: {2x+y=7x−y=2\begin{cases} 2x + y = 7 \\ x - y = 2 \end{cases}{2x+y=7x−y=2
x=1x = 1x=1
x=2x = 2x=2
x=3x = 3x=3
x=4x = 4x=4