The answer to your question is that you are not correct you have to read between the lines
The x-axis (horizontal) and the y-axis (vertical).
The set is not closed
Example
-4 * -2 = 8
8 is not a negative integer
Answer:
The slope is 
Step-by-step explanation:
Take the general equation of a straight line 
Here
is the slope of the line.
So let's get the equation of the line in the question in the same form.

Add
to both sides: 
Add
to both sides: 
Divide by
to get it into the general equation: 
Now compare it to the general equation to find the value of
. The value of
is the coefficient of
which we can see is 
Let number of Adult ticket be x
and number of Child ticket be y
so
$282 = $24x + $18y.
:)