Question 412277
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Hi
Let x and y represent the cost of popcorn and soda respectively
Question states***
 x + 2y = $11.75
 2x + y = $13.00

 -2x -4y = -23.50
  2x + y = 13.00
     -3y = -10.50
       y = $3.50, cost of a soda
 x = 11.75-2y = $4.75, the cost of popcorn

CHECKING our Answer***
  2*$3.75 + $3.50 = $9.50 + $3.50 = $13.00