YES, all linear equations have x-intercepts. because of the x, y has to be there 2!
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Yes - provided you allow both x and y intercepts.
Do all linear graphs have proportional relationship
Line graphs may represent equations, if they are defined for all values of a variable.
They are not. A vertical line is not a function so all linear equations are not functions. And all functions are not linear equations.
All direct variation graphs are linear and they all go through the origin.