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ZanzabumX [31]
3 years ago
13

Solve the system of equations by substitution. y = -X 3x + 3y = 0

Mathematics
1 answer:
zepelin [54]3 years ago
6 0

Answer y=x,3x+3y+0

Step-by-step explanation:

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a cell phone company has a basic monthly plan of $40plus $0.45 for many minutes ised over 700. John was charged a total of $48.1
jonny [76]
Cost of month plan = $40

Cost of minutes used = $0.45 after 700 minutes

Total cost = $48.10

Let x be the total minutes used
Total cost = 40 + 0.45(x - 700)

------------------------------------------------------------------
Form the equation and solve x
------------------------------------------------------------------
40 + 0.45(x - 700) = 48.10
40 + 0.45x - 315 = 48.10
0.45x - 275 = 48.10
0.45x = 48.10 + 275
0.45x = 323.10
x = 323.10 ÷ 0.45
x = 718

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Answer: John had used 718 mins this month
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8 0
3 years ago
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Step-by-step explanation:

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Rashid [163]
I belive the answer is d I think I am studying the same thing also
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3 years ago
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Which of the following is a complex number?<br> -7<br> 2 + StartRoot 3 EndRoot<br> 4 + 9i<br> Pi
zepelin [54]
Second to last one is my guess
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Answer:

1st option

Step-by-step explanation:

to find f(g(x)) substitute x = g(x) into f(x) , that is

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