The slope is change in y/change in x, so we have (y1-y2)/(x1-x2). This is the same no matter what's y1 or y2 as long as y1 is in the same point as x1. Plugging them in, we get (7-(-3))/(1-(-4))=10/5=2 as the slope. Therefore, we can make the function y=mx+b and since m is the slope, we have y=2x+b. Plugging -4 in for x and -3 in for y, we get -3=2*(-4)+b=-8+b. Adding 8 to both sides, we get b=5, meaning that we have y=2x+5. However, we have to put it in the form ax+by=c. To do that, we can subtract 5 from both sides to get -5+y=2x. Next, we can subtract y from both sides to get -5=2x-y
