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4 years ago

5х – 4у = 90 3х + y = — 56 how do i solve this using elimination?

Mathematics

1 answer:

sweet-ann [11.9K]4 years ago

7 0

Answer:

x=-7.88

y=-32.35

the point answer would be (-7.88 , -32.35)

Step-by-step explanation:

First step is to multiply 3x+y=-56 by 4 and you get 12x+4y=-224

Then add each equation together to eliminate y from each equation. You get 17x=-134

Then find divide that equation by 17. You would get x=-7.88

Then plug -7.88 into one of the original equations for x. 5(-7.88)-4y=90 And from that you get -39.4-4y=90

Then isolate the y variable. You would get -4y=129.4

Then divide by -4 and get y=-32.35

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How do u graph this

iren [92.7K]

$\bf \qquad \qquad \qquad \qquad \textit{function transformations}
\\ \quad \\
% function transformations for trigonometric functions
\begin{array}{rllll}
% left side templates
f(x)=&{{ A}}sin({{ B}}x+{{ C}})+{{ D}}
\\\\
f(x)=&{{ A}}cos({{ B}}x+{{ C}})+{{ D}}\\\\
f(x)=&{{ A}}tan({{ B}}x+{{ C}})+{{ D}}
\end{array}
\\\\
-------------------\\\\$

$\bf \bullet \textit{ stretches or shrinks}\\
\left. \qquad \right. \textit{horizontally by amplitude } |{{ A}}|\\\\
\bullet \textit{ flips it upside-down if }{{ A}}\textit{ is negative}\\
\left. \qquad \right. \textit{reflection over the x-axis}
\\\\
\bullet \textit{ flips it sideways if }{{ B}}\textit{ is negative}\\
\left. \qquad \right. \textit{reflection over the y-axis}$

$\bf \bullet \textit{ horizontal shift by }\frac{{{ C}}}{{{ B}}}\\
\left. \qquad \right. if\ \frac{{{ C}}}{{{ B}}}\textit{ is negative, to the right}\\\\
\left. \qquad \right. if\ \frac{{{ C}}}{{{ B}}}\textit{ is positive, to the left}\\\\
\bullet \textit{vertical shift by }{{ D}}\\
\left. \qquad \right. if\ {{ D}}\textit{ is negative, downwards}\\\\
\left. \qquad \right. if\ {{ D}}\textit{ is positive, upwards}\\\\$

$\bf \bullet \textit{function period or frequency}\\
\left. \qquad \right. \frac{2\pi }{{{ B}}}\ for\ cos(\theta),\ sin(\theta),\ sec(\theta),\ csc(\theta)\\\\
\left. \qquad \right. \frac{\pi }{{{ B}}}\ for\ tan(\theta),\ cot(\theta)$

so hmmm $\bf \begin{array}{llcll}
f(x)=&0.5sin(x)&+2\\
&\uparrow &\uparrow \\
&A&D
\end{array}$

instead of going up/down by 1unit, it goes up/down by half
and then it's shifted upwards by 2, so the midline will end up at y = 2

but basically the same sin(x) graph, just a bit shorter due to the smaller amplitude.

5 0

3 years ago

Need the value of X!!

vampirchik [111]

Step-by-step explanation:

127-83=44

9x-10=44

9x=54

x=6

5 0

3 years ago

. Write a real world example so that it combines to make zero in each situation below.

Vladimir [108]

Here are the examples that combine to make zero:

Two month ago, the temperature was 15 degrees. This morning, the temperature dropped to 15 degrees below zero.

Michael has $0 in his account. He makes a purchase of $75. Later in the day, he deposits 75 in the account.

An elevator rises to the ninth floor and she then takes the elevator from the ninth floor to the ground floor.

The parking garage is located 4 floors below ground level. But, her office is 4 floors above ground level.

<h3>What are the real world examples?</h3>

In order for the examples to combine to make zero, there has to be a positive number and a negative number. A positive number is a number that is greater than zero. A negative number is a number that is less than zero.

In order for the positive and negative number to make zero, they have to be added together. Addition is determining the total value or summing two or more numbers. Addition is one of the four basic operations in mathematics.

Two month ago, the temperature was 15 degrees. This morning, the temperature dropped to 15 degrees below zero. -15 + 15 = 0

Michael has $0 in his account. He makes a purchase of $75. Later in the day, he deposits 75 in the account. - 75 + 75 = 0

An elevator rises to the ninth floor and she then takes the elevator from the ninth floor to the ground floor. + 9 - 9 = 0

The parking garage is located 4 floors below ground level. But, her office is 4 floors above ground level. = -4 + 4 = 0

To learn more about addition, please check: brainly.com/question/19628082

#SPJ1

6 0

1 year ago

7 as a percentage of 20

Gennadij [26K]

7 as a percentage of 20 just means what percentage of 20 is 7. To do this, we must divide 7 by 20. This is how you answer this. If you do so, then you will get 0.35. This shows that it is 35%. Note that when you get a decimal number, then you must multiply it by 100% to get the percentage equivalent of that number. Therefore, 7 as a percentage of 20 is 35%.

5 0

3 years ago

Read 2 more answers

On a game show, a contestant wins $200 by answering questions correctly but loses $300 for

kirill115 [55]

Answer:

$2500

Step-by-step explanation:

$200×14=$2800

$2800-$300=$2500

5 0

2 years ago