Question

8x + 6y = 10

Answer 1

It could be D or C
The system has two solutions
x = .8 y = .6

OR if you think about it , (x=.8 y=.6) could be considered THE solution.
I would go with choice C

Answer 2

Here, Multiply second equation by 2, 
10x - 6y = 4.4

Now, Add both the equations, 
18x = 14.4
x = 14.4 / 18
x = 0.8

Substitute it in 2nd equation, 
5(0.8) - 3y = 2.2
-3y =2.2 - 4
y = 1.8/3
y = 0.6

Solution of the system of Equation is: (0.8, 0.6)

In short, Your Answer would be Option C

Hope this helps!