Hallar 2 numeros tales que 3 veses el segundo menos 6 veses el primero da por resultado 9; al mismo tiempo que 12 veses el primero menos 6 veses el segundo da por resultado 18. necesito las ecuaciones y el resultado por favor

For a science project, a high school research team conducted a survey of local air temperatures. based on the results of the survey, the found that the average temperatures were around 10 degrees higher than expected. this result was wrong. the trouble with the survey was that most of the locations were exposed to direct sunlight and located over asphalt or sand, which resulted in higher temperatures than normal. this is a classic example of an error in which phase of inferential statistics?