No.
A directly proportional graph has an equation of the form y = mx. It always passes through the origin.
A linear graph will have an equation in the from y = mx + c. This has a y-intercept at (0, c). It doesn't pass through the origin unless c = 0. The directly proportional graph is a special case of a linear graph.
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They are not. A vertical line is not a function so all linear equations are not functions. And all functions are not linear equations.
Do all linear graphs have proportional relationship
YES, all linear equations have x-intercepts. because of the x, y has to be there 2!
It means that there is no set of values for the variables such that all the linear equations are simultaneously true.
Because, if plotted on a Cartesian plane, all solutions to the equation would lie on a straight line.