Unit 4 · Class 8 IB MYP · Formula Sheet

Systems of Equations Formulas — Class 8 IB MYP

Solve systems of two linear equations graphically and algebraically.

Key Formulas

Substitution

\text{Express one variable, substitute}

Elimination

\text{Add/subtract equations to eliminate a variable}

Graphical Solution

\text{Point of intersection of two lines}

Worked Examples

1Using: Linear Equation

Solve 3x + 5 = 20.

Step 1: 3x = 20 - 5 = 15.

Step 2: x = 15 / 3 = 5.

Answer: x = 5

2Using: Algebraic Identity

Expand (a + 3)^2.

Step 1: Using (a + b)^2 = a^2 + 2ab + b^2

Step 2: = a^2 + 6a + 9.

Answer: a^2 + 6a + 9

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Frequently Asked Questions

How many formulas are in Class 8 IB MYP Systems of Equations?+
There are 3 formulas in the Systems of Equations chapter for Class 8 IB MYP. Each formula is essential for solving problems in this topic.
How to remember Systems of Equations formulas easily?+
Practice regularly with worked examples, group related formulas together, and use SparkEd's interactive practice mode to reinforce your memory through problem-solving.
Are these Systems of Equations formulas enough for exams?+
Yes, these formulas cover the complete IB MYP Class 8 syllabus for Systems of Equations. Practice applying them to different types of questions for full exam readiness.

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