Question

The point p (3,4) is the midpoint of the join of A (7,8) and B find tge coordinates of B

Answer 1

Answer:

B(-1, 0)

Step-by-step explanation:

coordinates of midpoint p(x,y) are calculated as

$x= \frac{x_1+x_2}{2}$  ---------- (1)

$y= \frac{y_1+ y_2}{2}$  -----------(2)

Here $(x_1, y_1) = (7, 8)$ and $(x_2, y_2) \ is \ unkwon$

Using equation (1)

$3=\frac{7+x_2}{2} \\x_2=-1$

Using equation (2)

$4=\frac{8+y_2}{2} \\y_2=0$