Question

Of Q is the midpoint od RP, Find the coordinates of R if P(9,-2) and Q (4,5)

Answer 1

(-1,12)

Explanation:

let R be(x,y)

Q(4,5)=midpoint

R(x,y)=(x1,y1)

p(9,-2)=(x2,y2)

now,

(4,5)= x1+x2/2 , y1+y2/2

(4,5)= x+9/2 , y-2/2

so,

x+9/2=4 y-2/2=5

x+9=8 y-2=10

x= -1 y=12

therefore, R(x,y)= (-1,12)