Download Find the Equation of a Line Given Two Points

MPM 1DI ­ U6 ­ D6 ­ Equation of a Line Given 2 Points.notebook
February 08, 2017
MPM 1DI ­ Unit 5 Linear Relations
Day 6
Finding an Equation Given 2 Points
So how do we get the equation of a line when we have two
points and neither of them is the y-intercept?
We still need slope.
use the FORMULA!
we still need the y-intercept
Use the slope you just calculated and one of
the points to find "b", just like last day
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MPM 1DI ­ U6 ­ D6 ­ Equation of a Line Given 2 Points.notebook
February 08, 2017
Warm up: Find equation of a line given slope and a point Example ­ find equation of a line with slope ­3 and
passing through the point (­1,2).
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MPM 1DI ­ U6 ­ D6 ­ Equation of a Line Given 2 Points.notebook
February 08, 2017
Find equation of a line given two points.
Find the equation of the line that passes through the points (4,3) and (7,9).
*
Step #1 ­ calculate slope
* Step #2 ­ Sub slope into y = mx + b
* Step #3 ­ Sub one point in for x & y and calculate b.
* Step #4 ­ Write the equation substituting in m & b. 3
MPM 1DI ­ U6 ­ D6 ­ Equation of a Line Given 2 Points.notebook
February 08, 2017
Example 1: Find an equation for the line passing through
(­3,1) and (­2,­5).
Example 2: Find an equation for the line passing through the
point (4,5) and with an x intercept of 8.
Example 3: Find an equation for the line passing through the point (4,5) and with a y intercept of 3.
Pg 342­343 # 1­4, 5(abdf), 8
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MPM 1DI ­ U6 ­ D6 ­ Equation of a Line Given 2 Points.notebook
February 08, 2017
Assigned work
Pg 342­343 # 1­4, 5(abdf), 8
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