How can you determine if the lines are perpendicular?

Question

anonymous · Answer

attachment

sammixboo · Answer

With given equations or a graph?

sammixboo · Answer

Ok

anonymous · Answer

do you determine if they have slopes with opposite values? have the same slope? if the product of their slopes is 1? or if the product of their slopes is -1?

sammixboo · Answer

Well, perpendicular is when lines are like this, and have two right angles |dw:1430406557664:dw|

sammixboo · Answer

Also you can get the equation of BOTH lines and compare them. If the slopes are reciprocals of each other then yes it's perpendicular .

And earlier I meant two or more 90 degree angles

anonymous · Answer

so if they have the same slope??

sammixboo · Answer

Same slope, but different y intercepts that means they are parallel

anonymous · Answer

No... it was determine if the product of their slope is -1 :/

sammixboo · Answer

I never heard of that