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Solving by Substitution II Step 1: Isolate one variable. Step 2: Substitute for the isolated variable. Step 3: Solve. Step 1: Isolate one variable. In this case, we will isolate “y” of the top equation. y+7=1−2x Step 2: Substitute for the isolated variable. Next we will substitute the “y” variable of the bottom equation with the equation of the “isolated y”. −7−7 y=−6−2x 3y=−11+x 3 −6−2x =−11+x Step 3: Solve. −18−6x=−11+x y+7=1−2x To solve for y, we substitute x into any given equation. −18=−11+7x y+7=1−2 −1 −7=7x −1=x y+7=1+2 y+7=3 y=−4

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