SOLUTION: How do i determin if x+y=5, x-y=1 are either parallel, perpendicular or neither? i need some one that will help me understand this and not tell me that i need to go back to bas

Question 284865: How do i determin if x+y=5, x-y=1 are either parallel, perpendicular or neither?
i need some one that will help me understand this and not tell me that i need to go back to basic arithmetic.
thanks
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!

Put each of your equations into slope-intercept form by solving each of them for

in terms of everything else. The slope of each of the lines will then be the coefficient on

. That is to say, make your equation look like:

and then the slope will be the value of

.

If the two slopes are negative reciprocals of each other, that is to say, if

, then the two lines are perpendicular. Otherwise, not.

Here is the rule:

And, just out of curiosity, why wouldn't you want someone to tell you that you need to go back to basic arithmetic if in fact you really need to go back to basic arithmetic?

John

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