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If 3x+2y=15 and x +y=10, what is the value of y ? |
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Answer» `-15` `x =10-y` ` 3 (10-y)+2y=15` `30-3y+2y=15` ` -y =-15` `y =15` If you NEEDED to KNOW the value of x as well, you COULD now substitute 15 for y into either equation to FIND that `c =-5.` The correct answer is (D). |
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