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What does independent variable and dependent variable mean in math?

For a house call, a veterinarian charges $70, plus $40 an hour. a. write an equation that represents the total fee y y (in dollars) the veterinarian charges for a visit lasting x x hours. equation: y= y= no response given b. find the x-intercept. x-intercept:

Which point is a solution to the inequality shown in this graph (-3,-1) (3,-1)