Can someone me figure out how to find b in these equations for perpendicular lines also it's do tomorrow so it would really if i got a answer tonight you
a: y=-2x-3
b: y=2x-3
c: y=2x-4
d: y=-2x-2

Amass weighing 16 pounds stretches a spring 8/3 feet. the mass is initially released from rest from a point 2 feet below the equilibrium position, and the subsequent motion takes place in a medium that offers a damping force that is numerically equal to 1/2 the instantaneous velocity. find the equation of motion if the mass is driven by an external force equal to f(t)=cos(2t).