Points B, C, G, and H represent the equation.
I would have figured this out by graphing the line.
y= -2x + 5
2x represents the slope and 5 represents where the line crosses the y-axis, aka the y-intercept.
So you can start at point (0,5) and then go down 2, right 1 (-2/1 = -2), connect those points to make a line and then see which points are on the line.
You could have also plugged each point's x-coordinate into the equation and see if the answer results in its y-coordinate or not.