Posted by **robbie** on Saturday, January 29, 2011 at 9:15pm.

can someone help in finding the ordered pair for this equation.

7x-9y=63

9y-7x=-63

- mat/116 -
**Henry**, Saturday, January 29, 2011 at 9:30pm
7X - 9Y = 63

-7X + 9Y = -63

m1 = -A/B = -7 / -9 = 7/9.

m2 = 7/9.

m1 = m2 = 7/9.

Threfore, the lines are parallel and

has no solution. Solve the Eqs and

you'll get 0 = 0.

- mat/116 -
**MathMate**, Saturday, January 29, 2011 at 10:02pm
Put it in another way, the lines are coincident and parallel, so they are consistent and we have an infinite number of solutions (at every point where the two lines overlap).

Given:

7X-9Y=63

Let t be any real number equal to X, then

X=t

Y=(7t-63)/9

where -∞<t<∞

- mat/116 -
**Henry**, Monday, January 31, 2011 at 12:30pm
So if we multiply the 2nd Eq by -1, we'll notice that the 2 Eqs are exactly identicak.

Thanks!

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