What is the equation of the line in slope-intercept form?

y = −2x + 8
y = −8x + 2
y = −2x + 16
y = 16x − 2

since the airplane is moving with constant speed then the distance travelled can be calculated by x=u*t

in km/h would be:

x=640*3.5=2.240 km

in m/s would be:

u=640 km/h= 640.000 m/h =640.000/ 3600 m/s =177.8 m/s

t= 3.5 h= 3.5 * 3600 s=12.600 s

then x=u*t= 177.8*12.600= 2.240.280 m

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72