If we already know one variable, then we can replace this value with one equation:
Let us choose the first equation:
[tex]2x+y=5[/tex]
Replace using x=3:
[tex]2(3)+y=5[/tex]
Solve for y:
[tex]\begin{gathered} 6+y=5 \\ y=5-6 \\ y=-1 \end{gathered}[/tex]
Hence, the value of y is -1.
