The number of new vehicle leases y$($in millions of$$ vehicles$)$ in the given category in year x can be approximated by the$$ following, where xequals$15$ corresponds to the year $2015.$ In what year were the number of passenger car leases and light truck leases the$$ same?

Passenger$$ Cars:

xplus$4$y

equals$25$

Light$$ Trucks:

minusxplus$5$y

equalsminus$7$

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Part $1$

The number of passenger car leases and light truck leases were the same in the year