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.

goog may have it for you

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it