Question 30582
LET US TAKE EQN.AS 
X+Y=1....
X INTERCEPT IS DISTANCE FROM ORIGIN TO POINT WHERE THE ABOVE LINE CUTS X AXIS.
IT IS OBTAINED BY PUTTING Y =0 AND SOLVING FOR X THE EQN.
HERE WE GET X+0=1...OR..X =1.....X INTERCEPT=1

Y INTERCEPT IS DISTANCE FROM ORIGIN TO POINT WHERE THE ABOVE LINE CUTS Y AXIS.
IT IS OBTAINED BY PUTTING X =0 AND SOLVING FOR Y THE EQN.
HERE WE GET 0+Y=1...OR..Y =1.....Y INTERCEPT=1
TO DO GRAPHICALLY PLOT THE GRAPH AND IND THE POINTS AS ABOVE AND THEIR DISTANCE FROM ORIGIN TO GET THE ANSWER
X=.........0..........1.........2..............3.........ETC...........
Y=1-X......1..........0.........-1.............-2.........ETC..........
GRAPH WILL LOOK LIKE THIS.....
{{{ graph( 600, 600, -5, 5, -5, 5, 1-x) }}}