Question

the midpoint of cd is e(-1,0). one endpoint is c(5,2). what are the coordinates of the other endpoint?

Answer 1

you want the average of the x values of the endpoints to equal the x value of the midpoint
you want the average of the y values of the endpoints to equal the y value of the midpoint

remember the average of two numbers is the sum of those numbers divided by 2

Answer 2

so you have the following two equations to solve:
\[\frac{5+x}{2}=-1 \text{ and } \frac{2+y}{2}=0\]

Answer 3

where (x,y) is assumed to be the other endpoint

Answer 4

ok thanks that really helps a lot

Answer 5

np :)