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3 years ago

What is the value of y in the equation 2(2y - 12) = 0? 4 6 7 8

Mathematics

1 answer:

ella [17]3 years ago

5 0

Answer:

The second option, 6

Step-by-step explanation:

opening the parentheses, the equation becomes,

4y - 24 = 0

4y = 24

y = 6

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3 years ago

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The excluded values of a rational expression are 2 and 5. Which of the following could be this expression?

Flura [38]

Answer:

It's the last choice: (x + 5) / (x^2 - 7x + 10).

Step-by-step explanation:

x^2 - 7x + 10

= (x - 5)(x - 2)

If these are a denominator of a rational expression then 2 and 5 will be excluded values.

This is because x = 5 or x = 2 makes the denominator = zero and the function then becomes undefined.

So the answer is (x + 5) / (x^2 - 7x + 10).

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4 years ago

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Ax + by = a - b bx - ay = a+ b by elimination

melisa1 [442]

$ax + by = a - b \: \: \: ...(i)\\ \\ bx - ay = a+ b \: \: \: ...(ii) \\ \\$

Multiply equation (i) with a and equation (ii) with b ,

${a}^{2} x + aby = {a}^{2} - ab \: \: \: ...(iii)\\ \\ {b}^{2} x - aby = ab + {b}^{2} \: \: \: ...(iv)$

Adding (iii) and (iv) , we get ,

$( {a}^{2} + {b}^{2} )x = {a}^{2} + {b}^{2} \\ \\ x = 1$

Now , from (i) ,

$ax+by=a−b \\ \\ a+by=a−b\\ \\ by=−b \\ \\ y=−1$

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2 years ago

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