A. Equation 2 does not contain the variable A. ZB. YC. XB. To obtain a second equation that does not contain this variable, A. Add equation 2 and 1B. Add equation 2 and 3C. Add equation 1 and 3

A Equation 2 does not contain the variable A ZB YC XB To obtain a second equation that does not contain this variable A Add equation 2 and 1B Add equation 2 and class=