Question

what does the y-intercept of this function represent
y= 2+ 4x
a- the original height of the plant was 4mm
b- the original height of the plant was 2mm
c- the height of the plant increases by 2 mm for every hour of sunlight it receives
d- the height of the plant increases by 4mm for every hour of sunlight it receives

Answer 1

what does x represent?

what does y represent?

Answer 2

the function below models the correlation between the number of hours a plant is kept in sunlight (x) and the height (y), in mm, to which it grows

Answer 3

so that sentence tell us...


x = number of hours

y = height

Answer 4

the y intercept is when x = 0

what does x = 0 mean?

Answer 5

if x=0 you go up 2

Answer 6

so the point (0,2) lies on this graph

Answer 7

x = 0, y = 2

telling us that at time x = 0 (ie 0 hours, the starting time) the height is 2 mm

Answer 8

for a lot of real world problems, the y-intercept represents the starting point (eg: of a trip or something)