Variation can be direct, joint, inverse and combined.
The constant of variation is (a) -10
The inverse variation is given as:
[tex]xy = k[/tex]
Rewrite the equation of the inverse variation as:
[tex]k = xy[/tex]
When x = -2, and y = 5, the variation equation becomes
[tex]k = -2 \times 5[/tex]
Multiply 2 and 5
[tex]k = -10[/tex]
Hence, the constant of variation is (a) -10
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