Hi Does anyone know what is meant by "the gradient-intercept form of a plane"?

I have found the general form of the equation which is $\displaystyle 10x-3y-11z=-20$, but I've never heard of a gradient-intercept form before. I'm a math tutor trying to help someone with their homework and I stumbled upon this new term.

I make use of gradients fortangentplanes, but ...