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3 years ago

Solve the system of equations below. A. B. C. D.

Mathematics

1 answer:

timofeeve [1]3 years ago

7 0

Answer:

A. (-7 -2)

Step-by-step explanation:

You can eliminate y by multiplying the first equation by 7 and subtracting 6 times the second equation:

7(-3x +6y) -6(5x +7y) = 7(9) -6(-49)

-21x +42y -30x -42y = 63 +294 . . . . eliminate parentheses

-51x = 357 . . . . . . . . collect terms

x = -7 . . . . . . . divide by -51. This matches answer choice A.

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3 years ago

Which expression is equivalent to 36x2 - 25?

Dimas [21]

Answer:

The equivalent expression is: (6x + 5)*(6x - 5)

Step-by-step explanation:

This expression is called the difference of two squares.

It has the following format: $a^{2} - b^{2}$

It is factored as: $a^{2} - b^{2} = (a-b)*(a+b)$

In this question:

$a^{2} - b^{2} = 36x^{2} - 25$

$a^{2} = 36x^{2}$ , then $a = \sqrt{36x^{2}} = 6x$

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2 years ago

What is the least common multiple of 26 and 39?

GuDViN [60]

Answer:

Step-by-step explanation:

Find the prime factorizations of the two numbers:

26 = 2 * 13

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The LCM is the product of common and not common factors with the higher exponent.

LCM = 2 * 3 * 13 = 78

Answer: 78

5 0

3 years ago

I need help on this question !!!

viktelen [127]

Answer:

C is the right answer I think

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2 years ago

Drag the numbers to complete the following statements.

Nitella [24]

Answer:

Step-by-step explanation:49.5

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3 years ago

Read 2 more answers