Solve -4x+y=6 and -5x-y=21 by Substitution

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In this free online math video lesson on Solving Systems of Equations by Substitution we solve each system by substitution. We Solve -4x+y=6 and -5x-y=21 by Substitution. #systemsofequations #substitution #minutemath

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Thank you so much for teaching it clearly, in the first time viewing your video i was literally confused because your formula was different from my math teacher.

nobara_edits
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thanks a lot! my teacher explained it in a harder way, thanks for making it easier!

sadeeen