Substitution Math Example 1

Follow the full solution, then compare it with the other examples linked below.

Example 1

easy
If y=3x+1y = 3x + 1 and x=2x = 2, find yy.

Solution

  1. 1
    Replace xx with 2 in the expression: y=3(2)+1y = 3(2) + 1.
  2. 2
    Compute: y=6+1=7y = 6 + 1 = 7.
  3. 3
    Substitution replaces a variable with its known value.

Answer

y=7y = 7
Substitution means replacing a variable with an equivalent value or expression. Here we replace xx with 2 to find the corresponding yy.

About Substitution

Replacing every occurrence of a variable or sub-expression with an equivalent value or expression throughout a problem.

Learn more about Substitution →

More Substitution Examples

Example 2 medium

If [formula] and [formula], use substitution to solve for [formula].

Example 3 easy

Evaluate [formula] when [formula] and [formula].

Example 4 medium

If [formula] and [formula], find [formula].

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