Yes, you can have a negative coefficient in a direct variation. So if you had y = -7x, that would be a direct variation. If you have y = -x, I do not know, if that is what you mean. Hope it helped.
7x+7=28x 28x-7x=7 21x=7 x=3
7x - 4 = 60 7x = 64 x = 9.14
-7x + 5 = -9 -7x = -14 7x = 14 x = 2
If x=2, then 7x = 14 and if y=5 then 4y=20.
-46 = 3x + 7x
103
7x + y = 8 Subtract 7x from each side of the equation: y = -7x + 8
7x is still the slope, no matter what x equals.
40 -7x = -16 -7x = -16 -40 -7x = -56 x = 8
7x + y = 4y = 4 - 7x
7x equals 3500