Question

Find the coordinates of the missing endpoint given that S is the midpoint of line RT.

T(-4,3), S(1-,5)

How do you work this out?

Answer 1

the the endpoint be R(a,b)

you should have learned that if (x1,y1) and (x2,y2) are any two points, then the midpoint is
((x1+x2)/2,(y1+y2)/2)

so (-4+a)/2 = 1
and (3+b)/2 = -5

solve the first equation for a, the second for b

Answer 2

S(-4,-6) and S(-7,-3) find T

Answer 3

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