,

Subtract from both sides of the equation.

Multiply each term in by .

Multiply .

Multiply by .

Multiply by .

Simplify each term.

Multiply by .

Multiply .

Multiply by .

Multiply by .

Subtract from both sides of the equation.

Divide each term in by .

Cancel the common factor of .

Cancel the common factor.

Divide by .

Simplify each term.

Divide by .

Move the negative in front of the fraction.

Create a graph to locate the intersection of the equations. The intersection of the system of equations is the solution.

Solve by Graphing x-y=25 , 2x+3y=180