A 5-minute international call costs $2.15 and a 12-minute call costs $3.06. The work shows how to write an equation where x represents the number of minutes, and y represents the total cost of an international call. Analyze the steps of the work to determine if the equation is correct. In which step did Emilia make an error? In step 2, she substituted the x values for y and the y values for x. In step 3, she didn’t use an x and y from the same coordinate pair. In step 4, Emilia solved for the wrong variable. Emilia did not make an error.