Respuesta :

QasimAli816

Answer:

Step-by-step explanation:

Consider the coordinates of B(x,y).

as M is midpoint of AB so,

2a = (x+a)/2

4a = x + a

x = 4a - a

x = 3a

Now for we will find y

2 = (7+y)/2

4 = 7 + y

y = 4 - 7

y = -3

Hence coordinates of B are ( 2a, -3 )

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