The ratio of legs to ears on dogs is 4: 2 if there were 20 legs how many ears would there be

Suppose a least-squares regression line is given by modifyingabove y with caret equals 4.302 x minus 3.293. what is the mean value of the response variable if xequals20?

Which graph represents the linear function below? y-3=1/2(x+2)

Ineed to know how to write question one in mathematical terms