Answer
1974=1.89 USD
1984=3.10 USD
1994=4.51 USD
2004=5.82 USD
Work Step by Step
Since we know that the prices of tickets got higher by 0.131 USD every year we can just calculate the number of years that have passed since 1974, which we will mark as "x", and just add it to the equation.
For 1974 x=0 since 0 years passed since 1974 therefore the price of ticket would be
$0.131\times0+1.89=1.89$ USD
For 1984 x=10 since 10 years passed since 1974 therefore the price of the ticket would be
$0.131\times10+1.89=3.20$ USD
For 1994 x=20 since 20 years passed since 1974 therefore the price of the ticket would be
$0.131\times20+1.89=4.51$ USD
For 2004 x=30 since 30 years passed since 1974 therefore the price of the ticket would be
$0.131\times30+1.89=5.82$ USD
