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Algebra Notes - Slope of a Line Solve for Y 2x 4 y 8 Can’t add or sub these Why? They are not Like Terms We want y by itself Move the x term (do the opposite + or -) Move the term in front of y (do the opposite x or ) Slope =_____ Y-intercept = ___ write it as D ________ Slopes ________ Slopes m C m B E m A Read line from left to right Going up—______ Going down--________ Types of lines Angles up Slope is ______ Angles down Horizontal Vertical Slope is ________ Slope is ______ Slope is _____ Find slope from a graph Going up is Positive right is left is Negative Positive Going down is Negative Slope is a fraction How far did you go up/down? Over How far did you left/right? rise up / down Slope = run left / right Write this on notes B Slope Slope Read line from left to right Going up— Going down-- A Find slope from a graph Going up is Positive right is left is Negative Positive Going down is Negative Pick two points on the grid Starting from left pt, count up or down on grid Write down that number in the numerator Count left or right to next point Write down this number in denominator This fraction is your slope Slope C D Slope Slope E Slope Read line from left to right Going up— Going down-- F Steps to find slope from 2 pts (x1, y1) (x2, y2) (2, 7) (8, 3) Formula (it will be given to you) y2 y1 m x2 x1 Label your points Example 1 m m (x1, y1) (x2, y2) (0, 4) (1, 2) y2 y1 m x2 x1 Label your points Example 2 m m y2 y1 m x2 x1 (x1, y1) (x2, y2) (7, -4) (9, -1) Label your points Plug points into formula Simplify top and bottom, then divide the two numbers Calculator (y2 - y1) divide (x2- x2) enter y2 y1 m x2 x1 Example 3-4 3) m m (x1, y1) (x2, y2) (10, 5) (3, 5) 0 (x1, y1) (x2, y2) 4) (-4, 2) (-4, 0) m m