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Systems of equations with substitution: potato chips

Khan AcademySal Khan

Systems of equations with substitution: potato chips

To solve a system of equations using substitution... 1. Isolate one of the variables in one of the equations, e.g. rewrite 2x+y=3 as y=3-2x. 2. You can now express the isolated variable using the other one. *Substitute* that expression into the second equation, e.g. rewrite x+2y=5 as x+2(3-2x)=5. 3. Now you have an equation with one variable ...

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Systems of equations with substitution: -3x-4y=-2 & y=2x-5

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