# Chapter Five - Algebra

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Chapter Five - Algebra. Big Ideas. Lesson 1 Linear Functions. Linear functions describe numerous real-world situations that involve constant rates of change (slope), such as cost, distance, and speed. In a linear function, a constant change in x corresponds to a constant change in y. - PowerPoint PPT Presentation

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• Chapter Five - AlgebraBig Ideas

• Lesson 1 Linear FunctionsLinear functions describe numerous real-world situations that involve constant rates of change (slope), such as cost, distance, and speed.In a linear function, a constant change in x corresponds to a constant change in y.The STANDARD FORM of a linear equation is Ax + By = C.The graph of a linear function is a line.

• Lessons 2,3,4 - Slope and InterceptsSLOPE is the constant rate of change shown by a line. SLOPE = change in y / change in x = y2 y1 / x2 x1The x-intercept is the x-coordinate of the point where the graph crosses the x-axis (where y = 0).The y-intercept is the y-coordinate of the point where the graph crosses the y-axis (where x = 0).

• Lesson 5 Direct VariationMany real-world relationships involve direct variations, including relationships in science, cooking, and medicine.When the dependent variable y depends only on the value of the independent variable x, the linear relationship is a direct variation, written in the form y = kx, where k is the constant of variation. (Direct variation contains only multiplication and always has a y-intercept of 0).

• Lessons 6 and 7 Forms of Linear EquationsLinear equations can be written in Slope-Intercept Form, Point-Slope Form, or Standard Form.

• Lesson 8 Slopes of Parallel and Perpendicular LinesParallel lines have the same slope. The slopes of perpendicular lines have a product of -1.

• Lesson 9 Transforming Linear FunctionsFor the function f(x) = mx + b (also known as y = mx + b):A change in b (the y-intercept) results in a translation (slide).A change in m (the slope) results in a rotation (turn).Multiplying m (the slope) by -1 results in a reflection (flip) across the y axis.