Working with Linear Equations
When graphing linear equations, you only need two points to draw the entire line. Remember that horizontal lines have a slope of 0, while vertical lines have undefined slopes.
Parallel lines have the same slope, while perpendicular lines have slopes that are negative reciprocals of each other theirproductequals−1. This relationship is super useful when solving geometry problems!
When solving linear equations, your goal is to isolate the variable using inverse operations. For example, if you have 3x + 4 = 10, subtract 4 from both sides, then divide by 3 to get x = 2.
Linear inequalities work similarly to equations but use symbols like <, >, ≤, or ≥ instead of equals signs. The key difference when solving them is that you flip the inequality sign when multiplying or dividing by a negative number.
🔑 The slope in a linear equation often represents a real-world rate of change - like speed in a distance-time graph or cost per item in a pricing model!