1. during first 10 seconds 2. between 10 seconds and 35 seconds 3. during 35 seconds to 40 seconds

1. y=mx+b

(5 , 5) (10 , 10)

5m+b=5     10m+b=10

10m+b-5m-b=5

5m=5

m=1

5+b=5

b=0

So for 1---10s the slope is: y = x

2. y=mx+b

(10 , 10) (35 , 10)

10m+b=10     35m+b=10

35m+b-10m-b=0

25m=0

m=0

b=10

So for 1035s the slope is: y=10

3. y=mx+b

(35 , 10) (0 , 0)

35m+b=10     b=0

35m=10

m=2/7

So for 3540s the slope is: y= 2/7 x

just pick what you think i need more time let me know if this

step-by-step explanation: