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Graphing Lines
Lesson 1
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Lesson 1: Graphing Linear Functions

Use slope-intercept form to generate graph points.

For a line in slope-intercept form, slope controls steepness and direction, while the intercept sets where the line crosses the y-axis.

Key formula

y=mx+by=mx+b

Worked example

y=2x+9,  x=3⇒y=15y=2x+9,\;x=3\Rightarrow y=15

Checkpoint

If y=−2x−5, find y at x=6\text{If }y=-2x-5\text{, find }y\text{ at }x=6

Recap

  • - Slope m determines rise over run.
  • - The y-intercept b is the point (0, b).
  • - Two correct points are enough to draw a line.
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