Simultaneous equations, substitution

Plug in x=y-3 to the equation x+y=12, open brackets but don't combine terms.

Plug in x=2y+1 to the equation x+5y=10, open brackets but don't combine terms.

Plug in x=y-1 to the equation 3x+7y=11, open brackets but don't combine terms.

Plug in x=5y+1 to the equation 4x+3y=10, open brackets but don't combine terms.

Plug in x=3y+7 to the equation -x+y=1, open brackets but don't combine terms.

Plug in x=5y-3 to the equation -x+3y=21, open brackets but don't combine terms.

Plug in x=-4y+4 to the equation -2x+y=1, open brackets but don't combine terms.

Plug in x= $\frac{y}{2}$  to the equation 4x+y=22, open brackets but don't combine terms

Plug in x= $\frac{3y}{7}$  to th equation 14x+3y=5, open brackets but don't combine terms.

Plug in x= ​ $\frac{2y}{5}$  +7   to the equation 10x+3y=5, open brackets but don't combine terms.