A theater company charged $6.50 per ticket for people of all age groups...

c

Step-by-step explanation:

You want to get the total number of people who attended the event, and since children's and adult's tickets cost the same you can add them together to see how many people bought tickets. Multiply the number of tickets by the ticket cost (6.50)

linear

step-by-step explanation:

x=-2

infinite number of lines, so there is an infinite number of equations.

step-by-step explanation:

there are an infinite number of line that passes through the point (-2,5)

x=-2   is one line that passes through the point

y = 5 is another line that passes through the point

(these two lines are perpendicular to each other).

since the number of   numbers are infinite and the slope is the ratio of two numbers,(change in y over change in x) we can have an infinite number of slopes.     our only condition is that it passes through the point (-2,5)