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Okay, these get easy with practice so don't post all of these online. First, substitute y in 3x-2y=9 for what it says y equals (2x-7). You now have: 3x-2(2x-7)=9. Breakdown: 3x-2(2x-7)=9 3x-4x+14=9 -1x=-5 x=5 next solve for y y=2x-7 y=2(5)-7 y=10-7 y=3 And now we have x=5, and y=3.
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