I am new, and not sure if this is the right forum. Here is my puzzle

Givenx_{1}y_{1}a_{11}+x_{1}y_{2}a_{12}=R_{1,}

x_{2}y_{1}a_{21}+x_{2}y_{2}a_{22}=R_{2, }x_{1}y_{1}a_{11}+x_{2}y_{1}a_{21}=C_{1 and }x_{1}y_{2}a_{12}+x_{2}y_{2}a_{22}=C_{2, }

can x_{1}be expressed in terms that do not include x_{2}, y_{1}or y_{2}?