To find the values of x and y for each equation, we can use substitution.

1) 2x - 3y = 8

Let's solve for x when y is given as 5
2x - 3(5) = 8
2x - 15 = 8
2x = 23
x = 23/2
x = 11.5

Therefore, when y = 5, x = 11.5

2) 5x + 2y = 1

Let's solve for x when y is given as -3
5x + 2(-3) = 1
5x - 6 = 1
5x = 7
x = 7/5
x = 1.4

Therefore, when y = -3, x = 1.4