By using the formula for a straight line equation graphed on the Cartesian plane by means of the x and y axes.
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The statement "A system of linear equations is a set of two or more equations with the same variables and the graph of each equation is a line" is true.
The solution of a linear equation in two variable comprises the coordinates of all points on the straight line represented by the equation.
A single linear equation in two variables has infinitely many solutions. Two linear equations in two variables will usually have a single solution - but it is also possible that they have no solution, or infinitely many solutions.
A graph of two simultaneous linear inequalities in two variables that have no intersecting regions must contain two lines with the same slope.