Question 2600
at time x=0, the height of the climber, y = 1200. This is your answer to part a) since the y-intercept is where x=0.


b. other coordinates are (8, 1224)


c. in 8 minutes, she climbs 24 metres. So, in 1 minute, she climbs? 3 metres. So she climbe 3 metres ever min... that is her rate.


Now "rate" is another word for gradient...so, knowing your y=mx+c standard form of a straight line, gives:


d. y = 3x+1200


e. in 18 minutes...


y = 3(18) + 1200
y = 54 + 1200
y = 1254m


make sense?


jon