Answer:
i would go for the first one but im not entirely sure
i suggest you wait to see other people's answers
The answer to this question is 4x= y-4
Since you have y alone on one side of the equation......
Use substitution and plug in 1/2x-4 for y in the other equation.

Distribute

Combine like terms

Add 8 to both sides

Divide by 4
and 
Plug this value in for x

Simplify

Multiply everything by 8 and simplify

Divide.....

Your answers are:

Answer: 1.13
Step-by-step explanation: 0.62-(-0.51) = 1.13
Hope it works