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inna [77]
3 years ago
10

Solve the following system of equations. Express your answer as an ordered pair in the format (a,b), with no spaces between the

numbers or symbols
2x+7y=-1 and 4x-3y=-19
Mathematics
2 answers:
AVprozaik [17]3 years ago
7 0
Multiply the equation 2x+7y=-1 by -2

add to othe equaiton
4x-3y=-19
<u>-4x-14y=2 +</u>
0x-17y=-17

-17y=-17
divide both sides by -17
y=1

sub back
2x+7y=-1
2x+7(1)=-1
2x+7=-1
minus 7 from both sides
2x=-8
divide both sides by 2
x=-4

x=-4
y=1
(x,y) is normal form
(-4,1) is answer
zzz [600]3 years ago
7 0

Answer:

The answer is (-4,1)

Step-by-step explanation:

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At the beginning of each year for 14 years, Sherry Kardell invested $400 that earns 10% annually. What is the future value of Sh
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Hmm if I'm not mistaken, is just an "ordinary" annuity, thus 

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3 0
2 years ago
Read 2 more answers
Wering a one-step expression for a real-world situation
Crazy boy [7]

Answer:

4d (the variable is usually x, though).

Step-by-step explanation:

Because 4 x the amount of fish in each tank = total amount of fish

8 0
2 years ago
Simplify (1 − cos x)(1 + cos x). (2 points)
Vadim26 [7]

Answer:

sin²x

Step-by-step explanation:

we have

(1 − cos x)(1 + cos x)=1-cos²x

Remember that

sin²x+cos²x=1 ------> i-cos²x=sin²x

therefore

(1 − cos x)(1 + cos x)=sin²x

4 0
3 years ago
Read 2 more answers
Will give brainliest ! 15 points please help &lt;3
andrey2020 [161]

Answer:

1. C

2. G, H

3. A, H

4. x=-4.5

5. B, D, F, G

Step-by-step explanation:

pls Mark Brainliest

8 0
3 years ago
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