The date of tho first sighting of robins has boon occurring earlier each spring

Question

The date of tho first sighting of robins has boon occurring earlier each spring over the past 25 years at a cortain laboratory. Scientists from this laboratory have developed two linear equations, shown below, that estimate the date of the first sighting of robins, where x is the year and y is the estimated number of days into the year when a robin can be expected. Complete parts a and b. (Hint: 2000 was a leap year.) y#816-0366x y 1512-0.713x a. Compare the date of first sighting in 2000 for each of these equations O O O O March 24, March 26 March 30, March 12 March 25, March 27 March 7, March 24

Explanation / Answer

x = 2000

According to the equation, y = 816 - 0.366x

y = 816 - 0.366(2000)

=> y = 84

84 = 31[Jan] + 29[Feb] + 24[March]

The date is March 24

According to the equation, y = 1512 - 0.713x

y = 1512 - 0.713(2000)

=> y = 86

84 = 31[Jan] + 29[Feb] + 26[March]

The date is March 26

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