Point M is the middle of the segment AB. What coordinate does point A have if M (3) and B (4/5)?

1) To find the length of the segment MV (BM), it is necessary to subtract the value of the coordinate of point B (4/5 = 0.8) from the value of the coordinate of point M (3).

MV = M – B = 3 – 0.8 = 2.2.

2) Since AM = BM, then AM = 2.2.

3) The total length of the segment AB = AM + BM = 2AM = 4.4.

4) To find the value of the coordinate of a point, it is necessary to add the value of the length of the segment AB to the value of the coordinate B.

A = B + AB = 0.8 + 4.4 = 5.2 = 5 1/5.

Answer: Coordinate of point A (5 1/5).