1. Copyright 2011 Davitily

2. Solving by Substitution
Step 1:
Isolate one variable. In this case the variable “y” is already isolated.
Step 1:
Isolate one variable.
Step 2:
Substitute for the isolated variable.
Step 3:
Solve.
Step 2:
Substitute for the isolated variable. In this case, we will replace the “y” of the bottom equation with the top equation.
Step 3:
Solve. In this case, we will
solve for x.
−28−4x
=2 + x
+4x+4x
−28=2+5x
−2−2
−30=5x
5 5
Now we solve for “y” by substituting in x into any given equation.
x = −6
𝑦=2+x
𝑦=2+−6
𝑦=−4

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