how do i find out if these two lines are perpendicular? please show me how to work the problem:
Stacey Warren - Expert brainly.com
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Okay, great! What are the slopes?
Fine I'll tell you how :)
i get the y =mx+b? or is there another method that would make this easier?
No you got it! y=mx+b where 'm' is the slope and 'b' is the y-intercept.
ok, then what do i do to the problem? first i get them in the correct format? and then?
I'll do the first one and you do the second one.
As you said you return it to the form y=mx+b
And right we said that y=mx+b where 'm' is the slope ?
What do we have instead of m here ? 2 right ?
For the first one the slope is 2.
Get it ?
yes, the second is y=-1/2x+3, so then what
Yep! What is the slope ?
-1/2, now how do i know if they are perpendicular?
Correct, you know they are perpendicular when you multiply the slope together you get -1
So yes they are perpendicular.
so if they equal -1 when multiplied they are perp? then are they parallel if they slop is similar and the y intercept is different?
Yes! Don't worry about the y-intercept.
why not worry about the y intercept?
Because you won't use it to know if they are perpendicular or parallel.
so is a line parallel if it has the same slope always?