Notice that as we got up 1 in x we got up 4 in y
x y
0 1
1 5
2 9
3 13
.... .....
100
The start value, when x = 0, y = 1
The rate of change is +4
y = mx+b where m is the rate of change and b is the y value when x =0
y = 4x+1
We want to find y when x = 100
y = 4(100) +1
400+1
y = 4001
When x = 100, y= 401
The equation is y = 4x+1