## Timer one year ago Find x and y such that the points A(-1,3), B(x,9) and C(5,y) are collinear with point B lying midway between Points A and C.

1. ghazi

use mid point formula that states that mid point is mean of two end points |dw:1356918181777:dw|$\frac{ -1+5 }{ 2 }=x$ similarly for y

2. ghazi

$\frac{ 3+y }{ 2 }=9$