$3x+4y=5$,  $y=-\frac{3}{4}x+\frac{5}{4}$,  Its slope is $-\frac{3}{4}$ and intercept is $\frac{5}{4}$. 
Given the equation $3x+4y=5$, find the slope and $y$-intercept. 
A) $m=-3, b=4$ 
B) $m=-3, b=5$ 
C) $m=\frac{3}{4}, b=\frac{5}{4}$ 
D) $m=-\frac{3}{4}, b=\frac{5}{4}$ 