How to Add and Subtract Expressions

Simplifying is the key!

Difficulty: Moderately Easy

Instructions

Things You'll Need:

• Calculators
• Desk Lamps
• Desks
• Pencils
• Graph Papers
• Pencils
• Pens
• Pencils
• Pens
• Calculators

1. Rewrite the equation so like terms are grouped together. Example: 2x + 7x simplifies to 9x.

2. Simplify the equation by adding/subtracting the coefficients of like terms. Example: 3x + 5y + 2x - 6y simplifies to 5x - y.

3. Stack the equations, if you're working with multiple equations, so that all like terms are placed in the same column.

4. Compute a new equation by adding/subtracting the coefficients of like terms. Example: (3x + 4y - 2z = 7) + (x - 3y + 8z = 1) = (4x + y + 6z = 8)

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