Answer :
if we rearrange this we get y=-70x+4000 (only swapped them around) which is the same as the linear equation of y=mx+c as m is -70 and c is 4000 so it is linear
if we rearrange this we get y=-70x+4000 (only swapped them around) which is the same as the linear equation of y=mx+c as m is -70 and c is 4000 so it is linear