Question

The midpoint of JK is point L at (–1, 8). One endpoint is J(4, –15). Which equations can be solved to determine the coordinates of the other endpoint, K? Select two options.

= –1
= 4
–15 + y1 =16

= y1
Mark this and return

Answer 1

Select the equations that come from the midpoint formula ((x1 + x2)/2, (y1 + y2)/2) = (–1, 8). With J(4, –15) and K(x, y) those are:

(4 + x)/2 = –1 → select the "= –1" option
(–15 + y)/2 = 8 → equivalent to "–15 + y1 = 16" → select that option

So choose "= –1" and "–15 + y1 =16".