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Kazeer [188]
3 years ago
14

What is the value of n?

Mathematics
1 answer:
vitfil [10]3 years ago
3 0
9(n+7) = 18(n+1)
9n + 63 = 18n + 18
9n = 45
  n = 5

answer
n = 5
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Answer:

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Step-by-step explanation:

Given equations are:

3x+4y=30\ \ \ Eqn\ 1\\3x-y=15\ \ \ \ Eqn\ 2

There are three methods to solve simultaneous equations

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We will use the elimination method as the coefficients of x in both equations are already same

Subtracting equation 2 from equation 1

3x+4y - (3x-y) = 30-15\\3x+4y-3x+y = 15\\5y = 15\\\frac{5y}{5} = \frac{15}{5}\\y = 3

Putting y = 3 in equation 2

3x-3 = 15\\3x = 15+3\\3x = 18\\\frac{3x}{3} = \frac{18}{3}\\x =  6

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The solution for given system of equations is: x = 6 and y = 3

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A: the center of the circle

B: the diameter of the circle

C: the radius of the circle

D: <em>not sure, could be the perimeter</em>

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