Can't see the table but direct variation is: y = kx So if the output is some constant multiple which could be positive, negative or fraction then yes it is direct variation. So just divide a couple y/x = k to see what you get.
Group and factor group y's with y's and z's with z's (y²-10y)+(10z-yz) factor y(y-10)+z(10-y) force undistribute -1 -y(10-y)+z(10-y) factor (10-y)(-y+z) (z-y)(10-y) or (y-z)(y-10)