Systems of Equations

Solve the system of equations using the method of substitution. 
    \[
        \begin{cases}
       \text{(I):}\ 2x-y+2=0 \\
        \text{(II):}\ 4x+y-5=0 \ 
        \end{cases}
    \]

 Solve the system of equations using the method of elimination.\[
        \begin{cases}
         \text{(I):}\ 4b+3m=3  \\
         \text{(II):}\ 3b+11m=13\ 
        \end{cases}
    \]

Solve the following system of equations:\[
    \begin{cases}
        \text{(I):} \ 3x+y=9 \\
        \text{(II):} \ 3x+y = 7
    \end{cases}    
    \]

Solve the following system of equations.\[
        \begin{cases}
       \text{(I):}\ 2x^2+3x-y=3 \\
        \text{(II):}\ 3x+y=-7 \ 
        \end{cases}
    \]