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Yes.
There are an infinite number of equations that meet that requirement. One of them is y = x
If you graph a system of two lines and all you see is one line, this means that both lines are the same. Any point on the line is a solution, so the system has an infinite number of solutions.
Infinite, both equations are equivalent and all possible solutions can be represented on the graph y = 4 - x
If the lines intersect, then the intersection point is the solution of the system. If the lines coincide, then there are infinite number of the solutions for the system. If the lines are parallel, there is no solution for the system.