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anonymous
 5 years ago
Solve the following using the elimination method. If the system has an infinite number of solutions, use setbuilder notation to write the the solution set. If the system has no solution, state this:
1) 3x  5y = 3
9x + 15y=9
2) 7x + 9y = 27
2x  7y = 21
anonymous
 5 years ago
Solve the following using the elimination method. If the system has an infinite number of solutions, use setbuilder notation to write the the solution set. If the system has no solution, state this: 1) 3x  5y = 3 9x + 15y=9 2) 7x + 9y = 27 2x  7y = 21

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.01) multiply first equation by 3, so your system: 9x15y=9 9x+15y=9 if you add them : 0=0 so your first eq=second one. no solution 2) multiply first eq by 2 & second by 7 14x+18y=54 14x49y=147 add them: 031y=93 31y=93 divide both sides by (31): y=3 substitute value of y in any original eq: 9*x15*(3)=9 9x+45=9 9x=54 x=6 solution: x=6, y=3

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0wouldn't you plug y into the equation 14x + 18y = 54 instead of 9x  15y = 9? I'm confused
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