7-2+Substitution

[|Solving Substitution]7-2 Cheyanna

= **__Solving Systems of Equations Using Substitution__** =

**1) Make sure at least one equation has a variable by itself** **2) Use that equation to substitute into the other equations** **3) Find your second variable by plugging what you get into an original equation** **4) Check you work using other equations**

**Use substitution when there is one equation with the variable by itself ( y=x+4 y=3x) or when there is two standard form equations (y=2x+7 5x-y=-4)**
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YOU TRY ex: 1) y=3x+1 y=-2x+4

2) y=4x-9 y=4x+5

3) x=5y-15 x+15y-1