Question 163717
Y=mX+b
line M:
slope=(13-9)/(5-3)=4/2=2
9=2*3+b
b=9-6
b=3 for the y intercept.
y=2x+3 (red line)
line N:
slope=(-11+9)/(5-3)=-2/2=-1
-9=-1*3+b
b=-9+3
b=6
y=-x+6 (green line)
{{{ graph( 300, 200, -6, 10, -10, 10, 2x +3, -x +6) }}} (graph 300x200 pixels, x from -6 to 10, y from -10 to 10, of TWO functions 2x +3 and -x +6).
Solutionis (1,5)
x axis intercepts are -1.5 red & 6 green. 
y axis intercepts are 3 red & 6 green.