Answer:
1/2
Step-by-step explanation:
When two lines whose scopes are m₁ and m₂ are perpendicular, then the product of the scopes of both lines is -1.
Therefore,
If m₁ is the scope of line a and m₂ is the scope of line b then,
m₁m₂ = -1 and m₁ = -2
-2m₂ = -1
m₂ = -1/-2 = 1/2
The slope of line b is 1/2.
