I believe whoever is the indirect object of the sentence.
I played around with the numbers and if you multiply 150,000 × 0.04 you get 6,000 which is the number we were looking for
So Mae should raise it by 4 percent
First, lets break up the equation into pieces.
The first variable is slope, in your case here, we have a slope of -3 or -3/1.
The other variable is the y-intercept, which is where place on the graph where you plot (0,X), in your case here we got (0,-4). That is the y-intercept.
to graph it you have to plot the y-intercept, and then identify the slope.
Here is an example.