The data shown in the table below represents either a linear or an exponential function. Which of the equations below best models this data set?

1) y=5(2)^x
2) y=10(2)^x
3) y=2x+10
4) y=10x+5

x - 1 , 2 , 3 , 4,
y - 10 , 20 , 40 , 80