compare linear functions 1 with linear function 2. which one has the greater rate of change

linear function 1: y = 15x + 8
linear function 2:
x y
5 26
13 34

linear function 1 has the greater rate of change, with a rate of change equal to 8 while linear function 2 has a rate of change equal to 1
linear function 2 has the greater rate of change, with a rate of change equal to 21 while linear function 1 has a rate of change equal to 8
linear function 2 has the greater rate of change, with a rate of change equal to 21 while linear function 1 has a rate of change equal to 15
linear function 1 has the greater rate of change, with a rate of change equal to 15 while linear function 2 has a rate of change equal to 1

linear function 2 has the greater rate of change, with a rate of change equal to 21 while linear function 1 has a rate of change equal to 15.