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DENIUS [597]
3 years ago
7

Solve using elimination: 3x + 2y = -13 and 3x + 4y = 1

Mathematics
2 answers:
artcher [175]3 years ago
7 0

So first we subtract the 2nd row from the 1st row

-2y=-14

We divide each side by -2 and leaves us with y=7.

Now we substitute y=7 into any of the two equations above.

Well I chose 3x+2y=-13

3x+2(7)=-13

3x+14=-13

Subtract 14 form both sides and leaves us with 3x=27

Now we divide each side by 3 and leaves us with 9

So the answer is (x,y)=(7,9)

Hope this helps :^)  

Nady [450]3 years ago
3 0
Let’s put the second equation on top

3x + 4y = 1
-3x + 2y = -13

I’m subtracting the first eqautionfrom the second

2y = 14
Y= 7
Plug in 7 for y in either of the original equations

3x + 28 = 1
3x = -27
X= -9

The answer is (-9,7)
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How do work this out
BabaBlast [244]
We can factor this by using grouping. Take the leading coefficient and multiply it by the constant. In this case we get 5*-7 = -35. 

Now we need 2 numbers that add to 2 and multiply to be -35. The numbers are -5 and 7.

So split the 2r into these two terms and group.

(5r^2 - 5r) + (7r - 7)

Factor both groups.

5r(r-1) + 7(r-1)

The factors of (r-1) can be added together to get the answer.

(r-1)(5r+7)
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3 years ago
The perimeter of a rectangle swimming pool is a 114 ft. The width is 7ft more than the lenth. Find lenght and width
Margaret [11]

Answer:

Length- 14 Width- 100

Step-by-step explanation:

First: 7x2=14

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Hope this helps

-Mercury

7 0
2 years ago
Read 2 more answers
the mean average distance that jack runs in his last 10 runs is 5.7 miles. work out the distance that he would need to make this
ziro4ka [17]

Answer:

9 miles

Step-by-step explanation:

mean is calculated as

mean = \frac{sum}{count} , then

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sum = 57

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sum + x = 66 , that is

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That is he would have to run 9 miles

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mote1985 [20]

Answer:

A

Step-by-step explanation:

Because 45 + 2x = 180 divide it by 2 gives 4

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3 years ago
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lapo4ka [179]
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3 years ago
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