# Solve by Substitution three x plus three y equals twenty-one , four x plus two y equals eighteen

,

Subtract from both sides of the equation.

First, divide each term by and Clarify.

Divide each term in by .

The common factor should be canceled of .

Cancel the common factor.

Divide by .

Clarify each term.

Divide by .

The common factor should be canceled and .

Factor out of .

The common factors should be canceled.

Factor out of .

Cancel the common factor.

Reformulate the expression.

Divide by .

Replace all occurrences of in with .

Simplify each term.

Use the distributive law.

First, multiply by .

Multiply by .

Add and .

Move all terms not containing to the right side of the equation.

Subtract from both sides of the equation.

Subtract from .

Divide each term by and simplify.

Divide each term in by .

The common factor should be canceled.

Cancel the common factor.

Divide by .

Divide by .

Replace all occurrences of in with .

Multiply by .

Subtract from .

The solution to the system of equations can be represented as a point.

The result can be displayed in a variety of ways.

Point Form:

Equation Form:

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