A system of linear equations is two equations with the same variables.
Graphical method: graph both lines and find their intersection. The coordinates of the intersection are the solution of the system.
One intersection point — one solution
Parallel lines — no solution
Coincident lines — infinitely many solutions
Find the intersection point of the lines.
{y=x+2y=−x+4
Find intersection point of two lines.
L1: y=x+2
L2: y=−x+4
(x,y)=(1,3)
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