Question 114083
FIRST YOU NEED TO FIND THE SLOPE(m).
SLOPE=(Y2-Y1)/(X2-X1)
SLOPE=(3-1)/(3-1)=2/2=1 FOR THE VALUE OF THE SLOPE
NOW REPLACE ONE SET OF (X,Y) VALUES FOR THE X & Y IN THE STANDARD LINE FORMULA:
Y=mX+b ALONG WITH THE SLOPE(m)=1 & SOLVE FOR THE Y INTERCEPT(b)
1=1*1+b
1=1+b
b=1-1
b=0
SO WE HAVE THE LINE EQUATION:
Y=1X+0 OR Y=X 
THE GRPAH OF THIS LINE FOLLOWS:
{{{ graph( 300, 300, -6, 6, -6, 6, y = x) }}} (graph 300x300 pixels, x from -6 to 6, y from -6 to 6, y = x).