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x/7+y/15=3, x/2-y/5=15 |
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Answer» 15x+7y/105=3, =5x -2y /10=1515x +7y =3×1055x-2y =15×1015x+7y=315. (1)5x-2y=150. (2)(2) multiplying 315x-6y=450(1)- (2)9y=165y. =165/9y=18.333is the correct answers y = 18.333 is the best answer. |
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