Answer:
X is zero
Explanation:
This is a substitution question,in which a value is given to be used in replace of a certain letter
So let's get back to the question
y+1/2x=0
And y is given to be -1/2x
That means we will have to solve for x
-1/2x+1/2x=0
Lcm for the two is 2
-x+x/2=0
Cross multiply
-x+x=0
The final answer to this question is zero
Hope you understand