Question 675215
Y=mX+b
6x+5y=20
5Y=-6X+20
Y=-6X/5+20/5
Y=-6X/5+4 
Setting Y=0 solve for the X intercept.
0=-6X/5+4
6X/5=4
6X=20
X=20/6
X=3.13 ANS. FOR X INTERCEPT.
THE Y INTERCEPT IS THE b VALUE (4).
PROOF: 
{{{ graph( 300, 200, -6, 5, -10, 10, -6x/5 +4) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions -6x/5 +4).