If 2x + y = 23 and 4x - y = 19; find the values of x - 3y and 5y - 2x.

If 10y = 7x - 4 and 12x + 18y = 1; find the values of 4x + 6y and 8y - x.

Solution of equations x + y = 8 and 3x - 5y = 0 is :

1. x = 5, y = -3

2. x = 5, y = 3

3. x = -5, y = 3

4. x = -5, y = -3