Question

The midpoint of AB is M(-1,-4). If the coordinates of A are (-3,-7), what are

the coordinates of B?

Answer 1

B(-1, -1)

Explanation:

Let the coordinates of point B B be x and y.

(-3 + x)/2 = -1

-3 + x = -2

x = 1

(-7 + y)/2 = -4

-7 + y = -8

y = -1

B(-1, -1)

Answer 2

(1,-1)

Explanation:

X-axis:

-3 ... -1 ... 1 (+2 per step)

Y-axis:

-7 ... -4 ... -1 (+3 per step)