8-3 Horizontal and Vertical Lines 8-3 Horizontal and Vertical Lines
8-3 Horizontal and Vertical Lines 8-3 Horizontal and Vertical Lines
8-3 Horizontal and Vertical Lines 8-3 Horizontal and Vertical Lines
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Mrs. Aitken’s Integrated 1 MathUnit 8 Linear Equations as ModelsExample 5Write an equation for each line.a. The points (9, 3) <strong>and</strong> (-1, 3) are on the line.b. The slope is undefined, <strong>and</strong> the point (-1, 4) is on the line.Solution 5a. slope = (3-3)/(9-1) = 0/8=0 <strong>Horizontal</strong> liney = 3b. x = -1 <strong>Vertical</strong> lineExample 6On the same set of axes, graph the equations x = 3 <strong>and</strong> y = 2. Where do thelines intersect?Solution 6The lines intersect at the point (3, 2).Summary<strong>Vertical</strong> lines have an undefined slope.<strong>Horizontal</strong> lines have a slope of zero.ReviewWrite in slope-intercept form1. 5x + 9y = 452. 0x – 11y = 22Solve3. –2(x + 4) = 84. 3t + 7 = 5 – 2t8-3 <strong>Horizontal</strong> <strong>and</strong> <strong>Vertical</strong> <strong>Lines</strong>
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