Oscar and Maria each wrote an equation that they felt represented the proportional relationship between distance in kilometers and distance in miles. One entry in the table paired 500 km with 75 miles. If y represents the number of kilometers and x represents the number of miles, who wrote the correct equation that would relate kilometers to miles? Explain why and show work to justify your reasoning. Oscar wrote the equation y = 0.15x and he said that 0.15 represents kilometers per mile.

Maria wrote the equation y = 6.7x and she said that 6.7 represents kilometers per mile.