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Use the concept of inverse variation
[tex]\sf\large{y=\frac{k}{w}}[/tex], where k is the constant of variation
[tex]\sf\large{y=\frac{1}{2}}[/tex] and x = 10, find k
[tex]\sf\large{ \frac{1}{2} = \frac{k}{10}}[/tex]
Cross multiply
10 × 1 = 2 × k
10 = 2k
[tex]\sf\large{k=\frac{10}{2}}[/tex]
k = 5
[tex]{}[/tex]
Now when x = -5, y = ?
[tex]\sf\large{y=\frac{5}{-5}}[/tex]
y = -1
Answer: -1