Question

determine weather the graphs of the equation are perpendicular
7x-9y=4
7y-9x=2

Answer 1

Step 1: Find their slopes.
Step 2: Multiply their slopes together (slope 1 ) times (slope 2)
Step 3: Is the product of the slopes (-1) ? YES = Perpendicular. NO = not perpendicular.

Answer 2

simple formula:

m1 x m2 = -1

Answer 3

so yes they are

Answer 4

?

Answer 5

just a sec, brb
i will giv u steps.

Answer 6

ok

Answer 7

http://www.twiddla.com/563630

Answer 8

there?

Answer 9

yeup

Answer 10

Saifoo -- the slopes are NOT 7 and 9. :(

line one: 7x-9y=4
line two: 7y-9x=2

To obtain slope, you must put it into y = mx + b form.

For line one:
-9y = -7x + 4
y = (7/9)x + (4/-9)
slope = 7/9


For line two
7y = 9x + 2
y = (9/7) + (2/7)
slope = 9/7

So multiply (7/9) and (9/7) to obtain +1, which is NOT (-1), so the slopes are not perpendicular.

See attached for pic.