The graph represents function 1, and the equation represents function 2:
a coordinate plane graph is shown. a horizontal line is graphed passing through the y-axis at y = 3.
function 2
y = 5x + 4
how much more is the rate of change of function 2 than the rate of change of function 1?

Primarily, horizontal lines mean zero slope. Therefore the equation is y= 3 because you are only left with the y-intercept at this point. The rate of change is another way of saying slope. Function 2's slope is 5 and function 1's slope is 0. Therefore, the rate of change of function 2 is greater than the rate of change of function 1 by 5. 
5 is the answer. 

4+2=-2. 1+2=3. y=-2/3x+b. 2=4/3+b. 2/3=b. the answer is y= -2/3x+2/3