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Furkat [3]
3 years ago
13

Got a fairly simple looking system of equations, 2k+4y=20, and 3x+6y=30 Don't understand how to prove what values of k provide -

1 solution - no solutions - and many solutions
Mathematics
1 answer:
Leya [2.2K]3 years ago
6 0

Answer:

2kx+4y=20 ⇒ kx+2y=10

3x+6y=30 ⇒ x+2y= 10

k is the coefficient of x, so it is the slope of the line

  • when k=1, both equations will be same, then there are many solutions
  • when k=0 there is one solution
  • when k is anything different, then the lines will be parallel, so no solutions
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Does 23^-1 (mod 1000) exist? If yes solve it.
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Yes, 23 has an inverse mod 1000 because gcd(23, 1000) = 1 (i.e. they are coprime).

Let <em>x</em> be the inverse. Then <em>x</em> is such that

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Use the Euclidean algorithm to solve for <em>x</em> :

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3 years ago
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So the scale factor to obtain this dilatation is 1/3</span>

</span>
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