2x-5y=9 and 3x+4y=25. Solve by the method of elimination.
Saturday, July 24th, 2010Solution:
1. 3x + 4y=25
2. 2x – 5y=9
We could rewrite these as follows by multiplying the first equation by 5 and the second by 4:
1. 15x + 20y = 125
2. 8x – 20y = 36
If we add the above two equations, we can eliminate y:
23x = 161
So x =3D 7, and plugging this into the first equation we can figure out
y: 21 + 4y =3D 25,
so y = 1
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