Posted by robbie on Saturday, January 29, 2011 at 9:15pm.
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.
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).
Let t be any real number equal to X, then
So if we multiply the 2nd Eq by -1, we'll notice that the 2 Eqs are exactly identicak.
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