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Graphs & Linear Equations Y X. Graphing Horizontal & Vertical Lines Y X This line has a y value of 4 for any x-value. Its equation is y = 4 (meaning y.

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Presentation on theme: "Graphs & Linear Equations Y X. Graphing Horizontal & Vertical Lines Y X This line has a y value of 4 for any x-value. Its equation is y = 4 (meaning y."— Presentation transcript:

1 Graphs & Linear Equations Y X

2 Graphing Horizontal & Vertical Lines Y X This line has a y value of 4 for any x-value. Its equation is y = 4 (meaning y always equals 4)

3 Graphing Horizontal & Vertical Lines Y X This line has a x value of 1 for any y-value. Its equation is x = 1 (meaning x always equals 1)

4 The Equation of a Vertical Line is X=Constant Y X x = 1

5 The Equation of a Horizontal Line is Y=Constant Y X y = 3

6 Graph the following lines Y = -4 Y = 2 X = 5 X = -5 X = 0 Y = 0

7 Answers Y X x = 5 x = -5

8 Answers Y X y = -4 y = 2

9 Answers Y X x = 0 y = 0

10 SLOPE = Slope is a measure of STEEPNESS

11 The Symbol for SLOPE = m Think of m for Mountain

12 SLOPE = How much does this line rise? How much does it run? (3,2) (6,4) (0,0) 1 2 3 1 2 4 3 56 4

13 SLOPE = How much does this line rise? How much does it run? (3,2) (6,4) (0,0) 1 2 3 1 2 4 3 56 4

14 m=SLOPE = (3,2) (6,4) (0,0) 1 2 3 1 2 4 3 56 4 x1y1x1y1 x2y2x2y2

15 (x 2,y 2 ) (64) (x 1,y 1 ) (3,2) Switch points and calculate slope Make (3,2) (x 2,y 2 ) & (6,4) (x 1,y 1 ) (x 1,y 1 ) (6,4) (x 2,y 2 ) (3,2)

16 Recalculation with points switched (x 1,y 1 ) (6,4) (x 2,y 2 ) (3,2) Same slope as before

17 It doesnt matter what 2 points you choose on a line the slope must come out the same

18 Keeping Track of Signs When Finding The Slope Between 2 Points Be Neat & Careful Use (PARENTHASES) Double Check Your Work as you Go Follow 3 Steps

19 3 Steps for finding the Slope of a line between 2 Points (3,4)&(-2,6) 1st Step: Write x 1,y 1,x 2,y 2 over numbers 2nd Step: Write Formula and Substitute x 1,x 2,y 1,y 2 values. 3rd Step: Calculate & Simplify (3,4) & (-2,6) x 1 y 1 x 2 y 2

20 Find the Slopes of Lines containing these 2 Points 1. (1,7) & (5,2) 5. (3,6) & (5,-5) 3. (-3,-1) & (-5,-9) 6. (1,-4) & (5,9) 4. (4,-2) & (-5,4) 2. (3,5) & (-2,-8)

21 1. (1,7) & (5,2) 5. (3,6) & (5,-5) 3. (-3,-1) & (-5,-9) 6. (1,-4) & (5,9) 4. (4,-2) & (-5,4) 2. (3,5) & (-2,-8) ANSWERS

22 Solve for y if (9,y) & (-6,3) & m=2/3

23 Review Finding the Slopes of Lines Given 2 Points 1st Step: Write x 1,x 2,y 1,y 2 over numbers 2nd Step: Write Formula and Substitute x 1,x 2,y 1,y 2 values. 3rd Step: Calculate & Simplify NOTE: Be Neat, Careful, and Precise and Check your work as you go..

24 ZERO Slope Horizontal Positive Slope Is Up the Hill Negative Slope Is Down the Hill NO Slope Vertical Drop

25 ZERO Slope Horizontal NO Slope Vertical Drop

26 Parallel Lines Have the Same Slope (0,0) 1 2 3 1 2 4 3 56 4 5

27 Perpendicular Lines Have Neg. Reciprocal Slopes (0,0) 1 2 3 1 2 4 3 56


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