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Unformatted text preview: 165 lb,
while a person 64 in. tall weighs 142 lb. Assuming the
relationship is linear, ﬁnd the slope of the line and discuss its
meaning in this context. Determine how many pounds are
added for each inch of height. Outline Linear Equations Graphing Linear Equations The Slope of a Line Horizontal and Vertical Lines A vertical line is a line having standard form x = h.
A vertical line has undeﬁned slope.
A horizontal line is a line having standard form y = k .
A horizontal line has slope 0.
x = −3 is the vertical line passing through (−3, 0).
y = 7 is the horizontal line passing through (0, 7). Applications Outline Linear Equations Graphing Linear Equations The Slope of a Line Applications Parallel Lines
Two distinct lines are parallel if they do not intersect.
Suppose L1 is a line with slope m1 and L2 is a line with slope m2 .
Then L1 is parallel to L2 if and only if m1 = m2 . In this case we
write L1 L2 .
Two vertical lines are parallel.
Show that if L1 passes through (−2, 0) and (0, 6), and if L2
passes through (1, 8) and (0, 5), then L1 L2 .
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