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4 years ago

Can I get some help please? Thanks!

Mathematics

1 answer:

AlladinOne [14]4 years ago

6 0

Okay. So we are talking about going down 4 units and going to the left 5 units. When we go down, we subtract outside of the parenthesis. D is out, because we go down, not up. C is eliminated, because that is not the amount we are going down. When it comes to horizontal transitions, adding means we move to the left, subtracting means we move to the right. In this case, we move to the left 5 units, so we add 5 inside the parenthesis. That also eliminates A. The only answer that works is B. The answer is B.

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Step-by-step explanation:

Let x be the weight of alloy having 90% gold and y be the weight of alloy having 50% gold .

Given : A jeweler wants to make 8 grams of a mixture that is 75% gold. She has an alloy that is 90% gold and an alloy that is 50% gold.

According to the above statement , we have the following system of equations :-

$\text{Total weight of mixture }: x+y=8-----------------(1)\\\\\text{proportion of gold in mixture}: \dfrac{0.90x+0.50y}{8}=0.75\\\\=0.90x+0.50y=6--------------------(2)$

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