Find the x - intercept of the graph of the equation

1) x + y = 9
2) 3x + y = 15
3) 2x + 3y = 12
4) x - y = 4
5) 4y - x = 18
6) 3y - 7x = 35
7) x - y = -1
8) 2x + 5y =14
9) 9x - 4y = 10


Help plz!!