# Pieces of a Mystery Line

Geometry Level 2

Consider two lines $9x+4y+1=0, \hspace{.5cm} 4x+15y+16=0.$ If a third line $$y=mx+b$$ has the same slope as the first line and passes through the $$x$$-intercept of the second line, what is $$\frac{b}{m}$$?

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