How can you use integers to represent the velocity and the speed of an object?

1)The SPEED of an object tells us how fast this object is moving, bit it doesn't indicate the direction of :
Speed = distance/time

2) The VELOVITY of an object tells us how fast this object is moving and in which direction it's moving ( If UP, then it's positive. If DOWN, then it's negative. Same logic for moving right (+) or left (opposite to right, then -) 
Velocity = distance/time

In short te absolute value of Velocity = Value of speed:

| Velocity | = Speed 

D. m < 13 (hope this )

Abecause c and d have two negative y-intercepts and b it's not telling you the right equation