Four adults and 5 children go to see a movie and buy $15 worth of concessions. the total cost of their trip is $71. if each child's ticket is $5, how much are the adult tickets?

$7.75 Take the 5 tickets at $5 to get $25. Add the $15 for concessions to reach $40. Subtract $40 from the 71 spent to get $31. Now divide the 31 by 4 for the amount of adults which equals $7.75

Step-by-step explanation:

Option d is correct.

no , because y does not vary directly with x.

Step-by-step explanation:

Direct variation states that a relationship between any two variables in which one is a constant multiple of the other.

in other way, when one of the  variable changes then the other changes in proportion to the first.

If y is directly proportional to x i.e,  

then the equation is of the form;

where k is the constant of Variation.

From the table:

Consider any values of x and y:

Let x = 4 and y = 28

then by definition of direct variation solve for k;

28 = 4k

Divide both sides by 4 we get;

k = 7

Then the equation become: y = 7x           .....[1]

Check whether the other data follows this equation or not,

x = 6 and y = 48

Substitute in equation [1];

48 = 7(6)

48 = 42 False

Also, for;

x = 8 and  y= 72

72 = 7(8)

72 = 56  False

⇒ y= 7x does not follows the data of the given table.

Therefore, y does not vary directly with x.