Which equation applies?

Exercise and reference answers

Questions

1. Question

   Workers and days on one job. Use

   Choices

   1. x₁y₁ = x₂y₂
   2. x₁/y₁ = x₂/y₂
   3. x + y = k

   Correct choice

   x₁y₁ = x₂y₂

2. Question

   Kilograms and cost. Use

   Choices

   1. x₁y₁ = x₂y₂
   2. x₁/y₁ = x₂/y₂
   3. x − y = k

   Correct choice

   x₁/y₁ = x₂/y₂

3. Question

   Speed and time on a fixed route. Use

   Choices

   1. x₁/y₁ = x₂/y₂
   2. xy = 0
   3. x₁y₁ = x₂y₂

   Correct choice

   x₁y₁ = x₂y₂

Explanation