You can put this solution on YOUR website!
Where's the 4 come from??
Assume there are X people going originally.
Then the cost per person is
When you add the 2 people you now have X+2 people and the cost per person becomes,
And you know that,
Now substitute into this equation.
Multiply both sides by the product of the denominators
This equation is factorable.
Two solutions but only the positive solution makes sense here.
dollars per person
dollars per person, a $2 reduction.