#### Answer

perpendicular

#### Work Step by Step

2x+5y=20
5y=-2x+20
y=-$\frac{2}{5}$x+4
10x-4y=20
4y=10x-20
y=$\frac{5}{2}$x-5
These two lines have slopes that are opposite reciprocals of each other, therefore, the lines are perpendicular.

Published by
Brooks Cole

ISBN 10:
0-53449-636-9

ISBN 13:
978-0-53449-636-4

perpendicular

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