Find the constant of proportionality and unit rate for the data in the table. then write the equation to represent the relationship between time t and distance d

time distance
2 hrs 90 miles
3 hrs 135 miles
5 hrs 225 miles
6 hrs 270 miles

i dont understand how to do this kind of math.

You should set up an X and Y table. Make time X and Distance Y. (the table is like a cross: on the left top put x and left top put y. Then under the line list the x and y numbers given in order.) Then find the "slope" which is y/x  (rise over run) then you get the increase rate of 45 mph. The relation between them would be D=45t 

Okay so it will be 1123