Question 929962
First simplify eq. 2,
{{{-x+2y=9}}}
Substitute from eq. 1,
{{{-(2y-9)+2y=9}}}
{{{-2y+9+2y=9}}}
{{{9=9}}}
True.
Eq. 1 and eq. 2 are the same equation.
Infinite number of solutions.