Linear Equations and Functions Words to Know

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Linear Equations and FunctionsWords to Know

• By
• Robert O. Mills Jr
• Hermitage High School
• Henrico County Public Schools

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Linear equation

• An equation whose graph is a straight line

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Slope (M)

• A measure of the steepness of a straight line
• Tells how fast one variable changes compared with
  the other.
• Rise over run

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Rise

• The change between two points on a line in an
  up-and-down direction

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Run

• The change between two points on a line in a
  left-to-right direction

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X-intercept

• The x-value of an ordered pair at the point where
  a line crosses the x-axis
• The x-value when the y-value is 0 (x,0)

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Y-intercept (b)

• The y-value of the ordered pair at the point
  where a line crosses the y-axis
• The y-value when the x-value is 0.(0,y)

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Slope-intercept form

• m is the slope.
• b is the y-intercept

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Standard form
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Direct variation

• K is a positive number.
• As one variable increases, the other increases.