Point-slope form is where y1 and x1 are your points from the coordinate and m is the slope. So yours would look like this: y-(-4)=-3(x-(-1)) or y + 4 = -3(x + 1)
Heyo just a freshman answering your question. To find the volume of a rectangular prism is by using its volume formula, vol=length*width*height. Your answer is 240 meter^3
where y1 and x1 are your points from the coordinate and m is the slope. So yours would look like this: y-(-4)=-3(x-(-1)) or y + 4 = -3(x + 1)