The midpoint of ST is (5,-8). If the coordinates of T are (5,-15) find the coordinates of S
●-------------●-----------● S(__,__) (5,8) T(0,4)
x-coordinates: from T to midpoint is 5 to 5, change of 0.
From midpoint to S is same change again, 0, going from 5 to 5.
x-coordinate of S is 5.
y-coordinates: From T to midpoint is -15 to -8, change of +7.
From midpoint to S is same change again, +7, going from -8 to -1.
y-coordinate of S is -1.
S is at (5,-1).