Can some on please show me how to solve these algebraic substitution problems

1)Y=3x-7
3x-u=7.


2)Y-x+3
2y+2x=4


3)X+y=16
2y=-2x+2

Hey Nolo345.

Hint: Try getting one equation in terms of y = blah and the substitute that into equation 2 and solve for x for each system of equations.