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OpenStudy (anonymous):
4x - 5y = 7 -4x + 5y = 7 How do I solve this equation using the addition method? I'm stuck as 4x and -4x cancel out, so do -5y and 5y which leaves me with 0 = 14...
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Directrix (directrix):
If this is a system of equations for which you are looking for a common solution: 4x - 5y = 7 -4x + 5y = 7 ------------ 0 = 14 indicates that the two lines do not intersect.
Directrix (directrix):
Good site for review: http://www.themathpage.com/alg/simultaneous-equations.htm
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