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OpenStudy (anonymous):
Which pair of equations, when graphed, has lines that are perpendicular? A. 3x+6y=8 Y=3x-8 B. 5x-8y=9 12x-5y=7 C.y=2x-7 X+3y=3 D. 2y=-3x+5 2x-3y=4
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OpenStudy (mathstudent55):
Solve every equation for y. Then every equation will be in the slope-intercept form, y = mx + b. m is the slope. Then for each pair of lines, look at the two slopes. If the slopes are negative reciprocals, then the lines are perpendicular.
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