Aim: What is the equation of a line? Do Now: Find the slope of the line 8x + 5y = 20 This is the slope – intercept form y = mx + b HW: Handout.

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Presentation transcript:

Aim: What is the equation of a line? Do Now: Find the slope of the line 8x + 5y = 20 This is the slope – intercept form y = mx + b HW: Handout

8x + 5y = 20 is the called general form We use the notation Ax + By + C = 0 for general form of a line What is the slope formula? We can change the general form to slope- intercept form by solving for y

If we cross-multiply This is called point-slope form

Summary of the equation of a line I. slope-intercept form y = mx + b II. General form Ax + By + C = 0

Drill