paralelll ines have same slope
in form
ax+by=c
slope=-a/b
point slope form
the equtaiotn of a line that passes through the point (x1,y1) and has a slope of m is
y-y1=m(x-x1)
so
find slope
24x+8y=7
slope=-24/8=-3
a point is (-5,-8)
m=-3
y-(-8)=-3(x-(-5))
y+8=-3(x+5)
y+8=-3x-15
y=-3x-23