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2. 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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