mat/116
posted by robbie .
can someone help in finding the ordered pair for this equation.
7x9y=63
9y7x=63

mat/116 
Henry
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
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:
7X9Y=63
Let t be any real number equal to X, then
X=t
Y=(7t63)/9
where ∞<t<∞ 
mat/116 
Henry
So if we multiply the 2nd Eq by 1, we'll notice that the 2 Eqs are exactly identicak.
Thanks!
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