Question 834037
{{{y=mx+b}}}
1.{{{5=6m+b}}}
and 
{{{m(4)+b=0}}}
{{{4m+b=0}}}
2.{{{b=-4m}}}
Substitute eq. 2 into eq. 1,
{{{6m+b=5}}}
{{{6m-4m=5}}}
{{{2m=5}}}
{{{m=5/2}}}
Then,
{{{b=-4(5/2)}}}
{{{b=-10}}}
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{{{y=(5/2)x-10}}}
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{{{ drawing(300, 300, -2, 8, -2, 8,
grid(1),
circle(4,0,0.25),
circle(6,5,0.25),
graph( 300, 300, -2, 8, -2, 8, (5/2)x-10) )}}}