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Slope-Intercept From 3

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Goal Given a table of data, find an equation of the line in the y=mx+b form.

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Step 1 Write original equation: y=mx+b

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Step 2

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Step 3 Plug the slope in for m into y=mx+b

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Step 4 Check to see if x=0 is a point. If so, that y- value is the y intercept. Plug that number in for b.

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Step 5 Of x=0 is NOT a point, then we must find b. Pick any point from the list and plug it in for x and y. Then solve for b. Plug b into final equation.

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Example 1 xY 0 12 25 38 411

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You try! xy 06 14 22 30 4-2

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Example 2 xy 110.5 212 313.5 415 516.5

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You try xy 135 250 364 480 595

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Homework Back of in-class examples

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Writing an Equation Using Two Points Goal: to write an equation of a line, in slope intercept form, that passes through two points.

Writing an Equation Using Two Points Goal: to write an equation of a line, in slope intercept form, that passes through two points.

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