Serena is ordering lunch from Tony's Pizza Parlor. John told her that when he ordered from Tony's last week, he paid $34 for two 16-inch pizzas and two drinks. Jodi told Serena that when she ordered one 16 -inch pizza and three drinks , it cost $ 23. Equations 2x+2y=34
x+3y=23

Verify your answer by graphing them?

I'm not good on neither I wish I was smart

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: