Which two lines are parallel?
I. 5y = –3x – 5
II. 5y = –5 – 3x
III. 3y – 2x = –1

Question

Which two lines are parallel?
I.    5y = –3x – 5
II.   5y = –5 – 3x
III.  3y – 2x = –1

callisto · Answer

Rearrange the equation into a slope-intercept form: y=mx+c, where m=slope
I.    5y = –3x – 5    => y = -3/5 y -1
II.   5y = –5 – 3x    => y = -3/5 y -1
III.  3y – 2x = –1    => 3y = 2x-1      => y= 2/3 x -1/3
So can you figure the answer out?

anonymous · Answer

a and b?

callisto · Answer

yea :)

anonymous · Answer

thank you(:

callisto · Answer

welcome, do you understand how to do this type of questions now?

anonymous · Answer

yes i do, thank youuuu!

callisto · Answer

You're welcome :) Glad to hear :)

anonymous · Answer

Whenever you need to evaluate if things are perpendicular or parallel, get them into the y=mx+b format and look at the values of m.  If they are the same, they are parallel.  If they are negative reciporacals, they are perpendicular :)