Slope-Intercept Part 2, Algebra 1, Writing Equations
Equations in Slope-Intercept have the form 𝑦=𝑚𝑥+𝑏, where 𝑚 is the slope (or rate) and 𝑏 is the 𝑦-intercept (0,𝑏) (or start amount). The 𝑥 is the independent variable and 𝑦 is the dependent variable.
If you can easily identify the exact 𝑦-intercept of a line on a graph: replace the 𝑚 with the value for the slope (rise over run) and replace the 𝑏 with the value of the 𝑦-intercept.
If you know the a point and 𝑦-intercept of a linear function, to write the equation: replace the 𝑏 with the value of the 𝑦-intercept (0,𝑏) and replace the 𝑚 with the value for the slope (rise over run).
If you know the start amount and another piece of information of a linear function with a constant rate, to write the equation: replace the 𝑚 with the value of the rate (rise over run) and replace the 𝑏 with the value of the start amount.
This video could work for #Algebra students who were absent, or in a flipped classroom.
See my full list of Algebra 1 lessons: • Algebra 1 Lessons
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0:00 Objectives
0:21 Intro
0:50 Different forms of linear equations
1:46 Example write equation from a graph
3:33 Equation from graph -Airplane
5:24 Equation from (0,4) and (3,10)
7:32 Equation from (0,2) and (4,-10)
9:44 Write Equation -Savings
11:28 Write Equation -Stock Price
13:17 Write Equation -Submarine
15:15 Wrap-Up