Linear Equations in Two Variables

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Linear Equations in Two Variables Section P-2
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Slope-Intercept Form y mx b mslope by-inter
cept
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Positive Slope
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Negative Slope
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No slope or when m 0
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Undefined Slope (always in the form xa number)
i.e.x4
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In a real-life problem, the slope of a line can
be interpreted as either a ratio or as a rate.
If the x-axis and the y-axis have the same unit
of measure, the the slope has no units and is a
ratio. If the x-axis and the y-axis have
different units of measure, then the slope is a
rate of change.
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Finding slope through two points m y2-y1
x2-x1
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Point-Slope Form y-y1m(x-x1)
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General Form ax byc 0 Standard Form ax byc
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Parallel Perpendicular lines Parallel lines
have same slope. Perpendicular lines have
negative- reciprocal slopes.