Changing from parametric form to algebraic form

[Burr2]

X1 T = 10T

Y1 T = 100 + (.5 * -9.8T^2)

X2 T = 100 - 12.3 T

Y2 T = 0

How do I put this into algebraic form? it seems easy but I just can't get it.

 

[andrevdh]

It seems these four equations describes the positional coordinates of two different objects as functions of time.

So what do you need to determine about these two objects?