y = -5x + 10
The word solution in an equation means finding the answer to one of the variable to find the answer for the other one.
In a graph there would be no intersection because there is no second equation
a system of equations is when 2 or more equations with the same variable are in the same coordinate plane.
a solution of two equations is when you have to find the answer to both of the equation to graph them.
In a graph they have to intersect in a point.