Hamza went to the convenience store and bought snacks and drinks for his friends. He bought a total of 12 items.
Each snack, c, cost $2.50 and each drink, d, cost $2. He spent a total of
$28.
Write two equations to represent the total number of items and the total
cost of the items.

2.5C + 2D = 28

C + D = 12

Step-by-step explanation:

answer: t=3

step-by-step explanation:

the direct variation says that:

then the equation is of the form is given by:

            where k is the constant variation.

from the given table:

consider any value of x and m(x)=y

x = 2 and m(x)=y = 3

substitute these value in [1]; we have;

divide both sides by 2 we get;

⇒

check:

put x = -1 and m(x) = -1.5

substitute in the equation:

-1.5 = -1.5                   true

therefore, the function m(x) represents a direct variation

graph of this function as shown below: