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Slope-Intercept From 3
Goal Given a table of data, find an equation of the line in the y=mx+b form.
Step 1 Write original equation: y=mx+b
Step 3 Plug the slope in for m into y=mx+b
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.
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.
Example 1 xY 0 12 25 38 411
You try! xy 06 14 22 30 4-2
Example 2 xy 110.5 212 313.5 415 516.5
You try xy 135 250 364 480 595
Homework Back of in-class examples
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