Just when I thought I was getting somewhere I still just can't quite crack it

I have;

3x + 2y = 3

5x - 1y = - 8

I am asked to solve the equations so this is what I have tried

(3+5)x + (2-1)y = 3 - 8

8x / 8 = - 5 / 8 =x - 0.625

3(-0.625) + 2y = 3

- 1.875 + 2y = 3

2y = 3 = 1.875

2y = 4.88

2y=4.88

2 2

y = 2.44

Check;

3(-0.625) + 2(2.44) = 3.00

5(-0.625) - 1(2.44) = - 5.57

The latter should be -8?

Anybody see what I am getting wrong?

Thanks

David