For the equation, y=mx-3, which passes through the point (7,-4), what is the value of m? need

The answer would be m = -1/7 or -0.143

Since we are given the value of b (-3) and a coordinate (7, -4), All you have to do is plug the x-coordinate into x and the y-coordinate into y; simplifying the equation to (-4 = m*7-3). Using simple algebra, find m by adding 3 to -4. Finally, divide that by 7 to get your final answer, (-1/7).

Your answer is m=-1/7 or -0.143. All you need to do is add 3 by -4. You then get -1.