Lesson 8.3 Finding Slope T/B pp. 378-383

How do you find slope of a line using the rise over run ratio? Essential Question: How do you find slope of a line using the rise over run ratio?

Activate: y2 – y1 / x2 – x1

Brain POP!: Slope

8.3 Vocabulary Review: Slope (Rise over Run) = Change in y divided by change in x. y1 –y2 x1 – x2

8.3 Vocabulary Types of slopes: Positive slope: the line rises from left to right or the change is positive. ¼ Negative slope: the line falls from left to right or the change in either y or x is negative – ¼ Zero slope: the line is horizontal. 0/4 Undefined slope: the line is vertical. 5/0

Identify the slope:

Identify the slope: Positive Zero Negative Undefined

Finding slope from a line Count the number of spaces up or down. Put that number as your numerator. (it is + if you went up, it is – if you went down) Count the number of spaces over. Put that number as your denominator. (it is + if you went right, it is – if you went left) Simplify your fraction if possible.

Find the slope:

Your Turn!

Your Turn!

Your Turn!

Your Turn!

Finding slope using the change of the y and x. To find slope you can subtract one y value from another. Then subtract the x values. (be sure to subtract in the same order as you did the y values) Divide your change in y by the change in x.

8.3 Vocabulary Review: Slope (Rise over Run) = Change in y divided by change in x. y1 –y2 x1 – x2

Video

Slope using change in y divided by change in x Find two different points on the line. Identify their ordered pairs. Subtract the y’s and x’s from each other. Divide your y value by the x value. (or at least write as a fraction)

Slope using change in y divided by change in x Find two different points on the line. Identify their ordered pairs. Subtract the y’s and x’s from each other. Divide your y value by the x value. (or at least write as a fraction)

Slope using change in y divided by change in x! (3, 9) (2, 5) (1, 7) (4,3)

Cool Down! ELO Practice W/B pp. 97-98 Pair/Share: Write a function that converts x pints to y cups. Graph the function!! Brain POP! quiz ELO Practice W/B pp. 97-98