Ashopping mall charges $30 per vehicle plus $2 per person as an admission fee. the total charge for a vehicle with x people is f(x) = 2x +30. how will the graph of this function change if the per vehicle charge is changed to $10 per vehicle? the line will shift vertically down by $10. the line will shift vertically up by $20. the line will shift vertically up by $10. the line will shift vertically down by $20.