Answer
$\frac{-b}{a}$
Work Step by Step
(a,0) and (0,b)
x1=a, y1=0,x2=0,y2=b
Using slope formula
m = $\frac{y2-y1}{x2-x1}$
m= $\frac{b-0}{0-a}$ = $\frac{-b}{a}$
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