Answer :

[tex]4x-16y=15\ \ \ /-4x\\\\-16y=-4x+15\ \ \ \ /:(-16)\\\\y=\frac{-4}{-16}x+\frac{15}{-16}\\\\y=\frac{1}{4}x-\frac{15}{16}\\\\\\\\the\ slope\ is\ \frac{1}{4}[/tex]