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Zepler [3.9K]
3 years ago
5

Y=6x+7 3x - 8y = 4 Substitute?

Mathematics
1 answer:
Rudik [331]3 years ago
3 0

Answer:

Y=1, X= -(4/3)

Step-by-step explanation:

Y=6X+7

3X-8Y=4

Substitute Y=6X+7

3X-8Y=4

3X-8(6X+7)=4

3X-48X-56=4

-45X-60=0, therefore 45X=-60=X=-4/3

Sub. X values in Equation

Y=6X+7

=6(-4/3)+7, therefore Y=-1

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If each data is increased by a constant K then find it's mean ?? answer fast pleaseeeeeeeeeee​
MArishka [77]

Answer:

The mean is also increased by the constant k.

Step-by-step explanation:

Suppose that we have the set of N elements

{x₁, x₂, x₃, ..., xₙ}

The mean of this set is:

M = (x₁ + x₂ + x₃ + ... + xₙ)/N

Now if we increase each element of our set by a constant K, then our new set is:

{ (x₁ + k), (x₂ + k), ..., (xₙ + k)}

The mean of this set is:

M' = ( (x₁ + k) + (x₂ + k) + ... + (xₙ + k))/N

M' = (x₁ + x₂ + ... + xₙ + N*k)/N

We can rewrite this as:

M' = (x₁ + x₂ + ... + xₙ)/N + (k*N)/N

and  (x₁ + x₂ + ... + xₙ)/N was the original mean, then:

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6 0
3 years ago
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