I don't understand this

y=4x+6

Step-by-step explanation:

when x=0 y=6

when x=1 y=10

when x=2 y=14

to find y=50:

50=4x+6

44=4x

11=x

x=11 when y=50

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m