Rodger's brother gave Rodger his collection of coins when he left for college. At that time, the value of the collection was $72 0. Twelve years later, the collection was worth $1080. What is the rate of change? Dong forget your units.
2 answers:
(0,720)(12,1080) slope = (1080 - 720) / (12 - 0) = 360/12 = 30 <== slope y = mx + b slope(m) = 30 (0,720)...x = 0 and y = 720 sub and find b, the y int 720 = 30(0) + b 720 = b <== ur y int ur equation : y = 30x + 720 ur slope is telling u that for every year, the value of ur coins goes up by 30 bucks the y int is just telling u the original value
Slope = (1080 - 720) / (12 - 0) = 360/12 = 30 <== slope y = mx + b slope(m) = 30 (0,720)...x = 0 and y = 720 sub and find b, the y int 720 = 30(0) + b 720 = b <== equation : y = 30x + 720
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