Respuesta :

slope is same
y=mx+b
m=slope

y=x/2-6
y=1/2x-6

the ones that are same are
y=1/2x+c, c is a real number

5 lines that are paralell are
y=1/2x+4
y=1/2x+324
y=1/2x+0.234
y=1/2x+pi
y=1/2x-234