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3 years ago

Solve the system of equations using elimination. 2x + y = 9 8x – 2y = 6

1 answer:

4 0

<span>(1) 2x + y = 9
</span><span>(2) 8x – 2y = 6
</span>
You can eliminate the x or the y. I am going to eliminate the y

First multiply the first equation 2x + y = 9 by 2.
2x + y = 9
2(2x + y = 9)
4x +2y = 18
Now we have a new equation that we can use and we can eliminate the y from the other equation because +2y - 2y = 0. Lets do that now and solve for x.

4x +2y = 18
8x – 2y = 6
12x = 24
12x / 12 = 24 / 12
x = 2
So we found the value of x, which is 2. To find y, insert 2 into one of the original equations. I am going to use 2x + y = 9
2x + y = 9
2(2) + y = 9
4 + y = 9
-4 + 4 + y = 9 - 4
y = 9 - 4
y = 5
y = 5.

Our point is at (x, y) = (2,5)
x = 2
y = 5

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2 years ago

What is y(x)+ab-5 I don’t get the problem

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Answer:

ab+xy−5

Step-by-step explanation:

yx+ab−5 = xy+ab+−5

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2 years ago

Any help on this???????????

Ivahew [28]

Answer:

x = 121°

Step-by-step explanation:

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2 years ago

When you subtract one equation from the other what is the value of x

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Answer:

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3 years ago

A used book store buys a hardback book for $1.50 and then sells it for $5. Over time, the store sells the same number of books i

dybincka [34]

A used book store buys a hardback book for $1.50 and then sells it for $5. Over time, the store sells the same number of books it buys. The store manager can use the equation P(x)=5x−1.5x to determine the store's profit, P(x), where x is the number of books that the store sells. Which statement about the book store is true based on the profit equation?

Cost Price of book, C.P.=$1.50

Selling Price of book, S.P.=$5

PROFIT=S.P. -C.P.

So, Profit=$5-$1.50=$3.50

So, Profit=$3.50 on each book

Or, we are given P(x)= 5x-1.50x

Or, P(x)=3.50x

For each book, we must divide the profit P(x) by x, that is, number of books

$\frac{P(x)}{x}=\frac{3.5x}{x}$

$\frac{P(x)}{x}=\frac{3.5*1}{1}$

$\frac{P(x)}{x}=3.5$

So, Profit for each book sold is $3.50

Answer:Option C

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3 years ago