Which of the points A (5.4), B (-10, -8) or C (2.5) belong to the graph of the function y = 0.8x?

For all points, we substitute the x coordinate as an argument to the function y = 0.8x. If we get the value of the function equal to the y coordinate, then the corresponding point belongs to the graph of the function:

ya = 0.8 * 5 = 4;

yb = 0.8 * (-10) = -8;

yc = 0.8 * 2 = 1.6;

The values of the function y = 0.8x at points A and B are equal to the value of the y coordinate.

Answer. Points A (5, 4) and B (-10, -8) belong to the graph of the function y = 0.8x.