Each and every value of y will satisfy any linear equation in which both x and y appear.
Without an equality sign the given expression can't be considered to be a straight line equation.
There isn't any. " yx-1 " is not an equation.
yx-3 is not an equation, and it has no graph.
Neither. It is a family of hyperbolae.
Without an equality sign the given expression is not an equation
y=x^3
It generates a hyperbolic paraboloid.
yx - 8 is an expression, not an equation nor an inequality. Consequently it cannot be graphed and so cannot have an intercept.
You can graph an equation or an inequality but you cannot graph an expression.
If you mean: y = x+4 then the perpendicular equation can be y = -0.5x+4
It would be y = 6x.
Without a second independent equation, it's not a 'system' yet.