The document discusses two examples of quantities that vary jointly: 1) The area A of a parallelogram varies jointly as its base b and altitude h, so a change in one requires a corresponding change in the other to keep A the same. 2) The kinetic energy K varies jointly as the mass m and velocity V of an object, so these quantities must change together to keep K the same.

1. JOINT VARIATION

6. Activity 1: Joint Together!

7. Activity 1: Joint Together!
4. The area A of a parallelogram varies
jointly as its base b and altitude h.
5. The kinetic energy K varies jointly as
the mass m and the velocity V of an
object in motion.

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13. Activity 1b: Combined Together!