If the point P(a,1) lies on the line 2x-3y-5=0, then find the value of a.
-4
0
2
4
If the point P(3,a) lies on the line x + 2y = 3, then find the value of a.
If the point P(8, a) lies on the line x4+y5=1, then find the value of a.