Cartesian Coordinate Graph of Exponential Equation or Function:

Therefore, the x-intercept of the graph of x + y = 5 is +5.  For a linear equation in the common form ax + by = c, the x-intercept and y-intercept can also be given in common form.

Any algebraic equation including two unknowns of any function associating two physical quantities can be plotted on a Cartesian coordinate graph. Linear equations/linear functions plot as straight lines on Cartesian coordinate graphs.  For instance, x + y = 5 and f(x) = 3x + 9 plot as straight lines.  Higher order equations/functions, like as quadratic equations or functions & exponential equations, can be plotted on Cartesian coordinate graphs.  Figure shows the shape of the graph of a typical quadratic equation or function.  This shape is known as a parabola.  Figure shows the shape of the graph of a classical exponential equation or function.

Figure:  Cartesian Coordinate Graph of Exponential Equation or Function