Many situations are more complicated than a basic direct variation or inverse variation model. One variable often depends on multiple other variables. When a variable is dependent on the product or quotient of two or more variables, this is called
joint variation . For example, the cost of busing students for each school trip varies with the number of students attending and the distance from the school. The variable
cost, varies jointly with the number of students,
and the distance,
Joint variation
Joint variation occurs when a variable varies directly or inversely with multiple variables.
For instance, if
varies directly with both
and
we have
If
varies directly with
and inversely with
we have
Notice that we only use one constant in a joint variation equation.
Solving problems involving joint variation
A quantity
varies directly with the square of
and inversely with the cube root of
If
when
and
find
when
and
Begin by writing an equation to show the relationship between the variables.
Substitute
and
to find the value of the constant
Now we can substitute the value of the constant into the equation for the relationship.
To find
when
and
we will substitute values for
and
into our equation.
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Every time someone flushes a toilet in the apartment building, the person begins to jumb back automatically after hearing the flush, before the water temperature changes. Identify the types of learning, if it is classical conditioning identify the NS, UCS, CS and CR. If it is operant conditioning, identify the type of consequence positive reinforcement, negative reinforcement or punishment
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