## Algebra 1: Common Core (15th Edition)

If we solve the first equation for y, $y+x=x\qquad$ ... add $-x$ $y=0$ Substituting $0$ for $y$ in the second equation, the LHS is undefined, because there is a zero in the denominator. The RHS is defined, the number 4. There is no x that would make this equation true. Therefore, the system has no solutions.