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Dafna1 [17]
3 years ago
12

1. Solve the following system of equations by elimination. What is the value of x?

Mathematics
2 answers:
mrs_skeptik [129]3 years ago
3 0

Answer:

x = 1 (Option C)

Step-by-step explanation:

3x - 4y = -5 (1)

-3x - 4y = -11 (2)

On adding

3x - 4y - 3x - 4y = -11 + 5

6x = 6

x = 6/6

x = 1

artcher [175]3 years ago
3 0

Elimination method is a method of eliminating one of the variables from the two equations whose remaining variables will be simplified..

3x - 4y= -5 (×1) 3x - 4y= -5

-3x - 4y= -11 (×1) <u>-3x</u><u> </u><u>-</u><u> </u><u>4y</u><u> </u><u>=</u><u> </u><u>-11</u><u> </u><u>(</u><u>-</u><u>)</u>

6x = 6

6x/6 = 6/6

x = 1

the value of x is <em><u>1</u></em>

Answer: Option [C]

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The quantity reported an <em>equivalent net</em> percentage change of 28 percent.

<h3>How to calculate the net change of a quantity in percentages</h3>

In this problem we must determine the <em>simple</em> percentage change equivalent to two <em>consecutive</em> percentual changes. The formula that describes the situation is:

1 + r/100 = (1 - 60/100) · (1 + 80/100)

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The quantity reported an <em>equivalent net</em> percentage change of 28 percent.

<h3>Remark</h3>

The statement is incomplete. Complete form is presented below:

A quantity is changing. At first it descreased by 60 percent and it increased by 80 percent. What is net change of the quantity in percentage?

To learn more on percentages: brainly.com/question/13450942

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