Answer:
y=-x+5
Step-by-step explanation:
1.) Find the slope. You would use the slope formula: m=(y2-y1)/(x2-x1).
m=(7-4)/(-2-1), which equals 3/-3, or -1.
2.) Then, you would plug into y=mx+b with the slope, -1, and x and y from one of the points. Using the first point, we get 4=-1+b. 4+1=4, therefore b=5, and we can put it in.
3.) Now we have our equation. y=-x+5
