Posted by **mysterychicken** on Friday, May 6, 2011 at 2:35pm.

40. The graph of the following system yields perpendicular lines.

x + 2y = -10

-4y = 2x + 20

(True?)

47. The graph of the following system yields parallel lines.

2y = -10 + x

-4y = 2x + 20

(True)

48. The graph of the following system yields parallel lines.

x - 2y = 1

y = -3x + 10

(False)

Are these correct?

Thanks

-MC

- Algebra -
**Reiny**, Friday, May 6, 2011 at 5:05pm
47.

2y = -10 + x ----> y = (1/2)x - 5

-4y = 2x + 20 ---> y = (-1/2)x - 5

one slope is 1/2 then other is -1/2, so NOT parallel

your best way is to rewrite in the form

y = mx + b like I did above.

Why are you unsure about the first one ?

- Algebra -
**mysterychicken**, Friday, May 6, 2011 at 5:19pm
Thanks; are the other 2 correct?

-MC

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