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 When you substitute an expression, you replace each variable with a given value.

Step-by-step explanation: When you substitute, you replace some number with another number that doesn't really change the value of the expression.

1. When you substitute an expression, you replace each variable with a given value

Step-by-step explanation:

Substitution means putting numbers in place of letters to calculate the value of an expression. Or replacing the variables (letters) in an algebraic expression with their numerical values.

x = 1 , y = 8  thus: A. is your answer

Step-by-step explanation using substitution:

Solve the following system:

{y = 2 x + 6

y = 11 - 3 x

Hint: | Perform a substitution.

Substitute y = 2 x + 6 into the second equation:

{y = 2 x + 6

2 x + 6 = 11 - 3 x

Hint: | Choose an equation and a variable to solve for.

In the second equation, look to solve for x:

{y = 2 x + 6

2 x + 6 = 11 - 3 x

Hint: | Isolate x to the left hand side.

Subtract 6 - 3 x from both sides:

{y = 2 x + 6

5 x = 5

Hint: | Solve for x.

Divide both sides by 5:

{y = 2 x + 6

x = 1

Hint: | Perform a back substitution.

Substitute x = 1 into the first equation:

{y = 8

x = 1

Hint: | Sort results.

Collect results in alphabetical order:

{x = 1 , y = 8