I NEED HELP PLEASE! :)
Are the two lines parallel, perpendicular, or neither? Explain your answer. Show work needed to answer the question.
3x+7y=15
7x-3y=6

Perpendicular

Step-by-step explanation:

To tell if the lines are perpendicular/parallel, you must look at the slope, but in this case, you must first get y by itself, like so:

3x + 7y = 15

-3x           - 3x

___________

7y = -3x + 15

Divide both sides by 7:

y =

Now the other equation:

7x - 3y = 6

-7x         -7x

_________

-3y = -7x + 6

Divide both sides by -3:

y =

You can see that the lines are perpendicular because the slopes ( and ) are opposite reciprocals.

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