$1.1 more per mile
x represents the number of miles that trip, and y is the total amount.
Therefore, in y = 1.3x + 2, the coefficient, 1.3, is the amount Matthew's company charges every mile, as the amount per mile times the number of miles is the subtotal, which will be added to the initial 2 dollars.
And, as given, Jayden's charges 2.4
2.4 - 1.3 = $ 1.1 to find the difference
