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Blizzard [7]
4 years ago
8

Alvin’s first step in solving the given system of equations is to multiply the first equation by 2 and the second equation by –3

. Which linear combination of Alvin’s system of equations reveals the number of solutions to the system?
9x + 4y = 36

6x + 2.5y = 24
Mathematics
2 answers:
joja [24]4 years ago
6 0
The answer 

9x + 4y = 36           (times 2) implies      18x + 8y = 72     (a)<span>

6x + 2.5y = 24        </span>(times -3) imiplies    18x + 7.5y =72   (b)

so (a) - (b)            8-7.5)y=0, and y=0

when y=o  18x + 8. 0= 72 implies x =4

so the solution is (4,0)
diamong [38]4 years ago
5 0
After multiplying by the stated coefficients and adding, the equation obtained is:
8y - 7.5y = 0
y = 0
x = 4

Because the two equations formed were independent, they had one solution.
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HELP ASAP!! WILL GIVE BRAINLIEST!!!! FULL ANSWERS ONLY!!!!!!
Dimas [21]

Answer:

12

Step-by-step explanation:

x = 2n

2n + 2n + 2 + 2n + 4 + 2n + 6 + 2n + 8 = 80

10n = 60

n = 6

x = 12

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6 0
3 years ago
Edward deposited $7,000 into a savings account 4 years ago. The simple interest rate is 5%. How much
Oliga [24]

answer: $1,440

explanation: here’s the equation with the values in this case

>> interest = 7,000 x 0.05 x 4

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8 0
3 years ago
The environment club is selling indoor herbs gardens for Earth Day. Each member is encouraged to sell at least 10 gardens. You s
Ad libitum [116K]
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7 0
3 years ago
The cost per purse is $17 each to make, and she sells them for $35 each. This Saturday, she is renting a booth at a craft fair f
klasskru [66]

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N = Number of purses

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17N = Cost of each purse

T = 35*N - 17*N - 75

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If she wants here total income to be 350 dollars, it will take

T = 350 ; N = unknown.

350 = 18N - 75 Add 75 to both sides.

350 + 75 = 18N

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6 0
3 years ago
There is a high-speed rail track between London and Manchester.
Keith_Richards [23]

Answer:

Step-by-step explanation:

this is the famous dirt formula,  :P  I made it up   :D

D=rt    ( notice it looks like   Dirt  , kinda,  but it also means it dirt simple )

D= distance

r = rate  ( think speed or how fast)

t = time  ( in what ever units of time you want to use, seconds, minutes, hours )

13:28 - 11:20 = 128 minutes ( b/c the question is asking in MPH convert to hours)   2.4666667 hours

210 miles =  r * 2.46666667

210 / 2.46666667 = r   ( in MPH) ( does anyone else find it odd that they are saying miles in London instead of kilometers? :/ )

85.135 MPH = rate

so no, not even close to 104 MPH  :/  

7 0
3 years ago
Read 2 more answers
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