Please I need help I only got one day to finish this and I don’t understand it just one question please is for a lot of points

Given the graph below state whether or not the relation is a function, and give the domain and range.

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

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?