What would the equation look like when the line is perpendicular to 2x-3=4y and has Y- intercept of -5/4

2x - 3 = 4y

Eq1: 2x - 4y = 3
m1 = -A/B = -2/-4 = 1/2

m2 = -(2/1) = -2

Y = mx + b
Eq2: Y =-2x - 5/4.