a candle has been burning for 20 min and is now 25 cm tall. in an hour it will be 10 cm tall. which equation models the height of the candle y in cm x minutes after it was lit??

best answer
Given that Candle has been burning for 20 minutes and is now 25 cm tall. In one hour it will be 10 cm tall. Therefore this height went from 25 to 10 cm ( = 15 cm) in 60 minutes . In 20 minutes it will be reduced by 5 cm thus the original height was 30 cm ( at time 0). y-25=-.25 (x-20) At x = 0 minutes y = 30; 30 - 25 = 5