Answer:
y=2x+4
Explanation:
m is slope.
Slope is change in y over change in x.
Line goes up (+y) two for every move to the right (+x), so the slope is 2.
B is the y-intercept, where the line crosses the y-axis. It crosses at 4, so B is 4.
Plug those into y=mx+b to get
y=2x+4.