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Learn the basics of algebra and slope-intercept form with Khan Academy's free online educational resources.
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Worked examples practicing the relationship between slope, y-intercept, and linear equation in slope-intercept form.
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An old video where Sal finds the slope-intercept form of a line that has a slope of ⅓ and goes through the point (-12,-14/3).
Estimating equations of lines of best fit, and using them to make predictions. Line of best fit: smoking in 1945. Estimating slope of line of best fit. Equations of trend lines: Phone data. Linear regression review. Math>. Statistics and probability>. Exploring bivariate numerical data>.
Practice determining what each of the slope, x-intercept, and y-intercept represent in a given linear relationship.
We use scatter plots to explore the relationship between two quantitative variables, and we use regression to model the relationship and make predictions. This unit explores linear regression and how to assess the strength of linear models.
The x-intercept is where a line crosses the x-axis, and the y-intercept is the point where the line crosses the y-axis. Thinking about intercepts helps us graph linear equations.