Understanding Slope and Intercepts

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Avery is planning a straight path for a new walking trail in the park. Which of the following equations could represent a path that starts at the origin?

Elijah is planning a road trip and wants to calculate the distance he will travel. He knows that for every 4 hours of driving, he covers 8 miles. What is the equation that represents the relationship between the time driven (in hours) and the distance covered (in miles)?

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Anika is designing a ramp for a skateboard park. The ramp needs to have a slope of 3 and pass through a point that is 2 meters horizontally and 4 meters vertically from the start. What is the equation of the ramp?

Emma is comparing different phone plans. Which of the following graphs represents a proportional relationship between the number of minutes used and the total cost?