For this case we have that by definition, the equation in the form of slope-intersection is given by:

Where
Substituting the given point:
and the cutoff point
we can find the slope,
We have:


Thus, the equation is given by:

Answer:

See attached image
Answer: 105 meters
Step-by-step explanation:
Ostrich's running rate is 63 meters/3 seconds. This can be reduced to 21 meters/second (21 m/s).
(21 m/s)*(5 sec) = 105 meters