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College Algebra / Unit 9   Alg 481 short lesson, about 20 seconds

Systems of Linear Equations

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The idea

A system of linear equations is a set of equations sharing variables; a solution is one assignment satisfying every equation at once — graphically, the intersection point.

In practice

x + y = 7 and x − y = 3 are both true only at (5, 2): one point on both lines.

Your place on the trail

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