Question

The endpoints of a segment are (10, 0) and (20, 0) how do you know it is a horizontal segment

Answer 1

You can see it easily if you graph A(10,0) & B(20,0) on a on a system of perpendicular axis. The horizontal values (x value =10 & 20) are on the x axis & the vertical values (y value=0 & 0) can't be on the y axis since y values are zero