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ss7ja [257]
3 years ago
10

Please I really need help 100 points

Mathematics
2 answers:
Amiraneli [1.4K]3 years ago
5 0

Answer:

<h2>x = 3 and y = -1 ⇒ (3, -1)</h2>

Step-by-step explanation:

\left\{\begin{array}{ccc}2x-3y=9&\text{multiply both sides by 5}\\3x+5y=4&\text{multiply both sides by 3}\end{array}\right\\\\\underline{+\left\{\begin{array}{ccc}10x-15y=45\\9x+15y=12\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad19x=57\qquad\text{divide both sides by 19}\\.\qquad x=3\\\\\text{Put the value of x to the second equation:}\\\\3(3)+5y=4\\9+5y=4\qquad\text{subtract 9 from both sides}\\5y=-5\qquad\text{divide both sides by 5}\\y=-1

Afina-wow [57]3 years ago
4 0

Multiply the first equation by 3 and the second equation by 2:

\begin{cases}6x-9y=27\\6x+10y=8\end{cases}

Subtract the two equation to get rid of the x variable:

-9y-10y=27-8 \iff -19y = 19 \iff y = -1

Use the value of y to determine the value of x: for example, using the first equation we have

2x+3=9 \iff 2x=6 \iff x=3

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I really need help would please like help thanks
ASHA 777 [7]
Hey there!

A reciprocal might be an unfamiliar vocab word, but the concept is really quite simple.

It's just a flipped fraction! Multiplying the flipped fraction by it's reciprocal gets you one, and that's how you check your answer.

So we have:

Reciprocal of 9/10 is 10/9, because 9/10 times 10/9 = 90/90 = 1

Reciprocal of 1/11 is 11/1, because 1/11 times 11/1 = 11/11 = 1

Reciprocal of 10(remember, it's 10/1) is 1/10, because 10/1 times 1/10 = 10/10 = 1

Hope this helps!
4 0
3 years ago
C = 172.7 cm
Anika [276]
I am hoping that the a in c = ad is supposed to be x.

The formula for circumference is c = pi * diameter with 3.14 substituting for pi.

Let’s plug in some values

172.7 = 3.14d

Divide

55 = d

The diameter should be 55 cm.
4 0
3 years ago
Read 2 more answers
What is the gcf of 66xy and 30x2y?
Schach [20]

Answer:

66yx , 30x2y, hope its right :)

Step-by-step explanation:

4 0
3 years ago
Select the correct word to describe the function. the equation y = startfraction 5 x cubed over 8 endfraction represents functio
balandron [24]

The functions and their descriptions are:

  • Polynomial: y = \frac{5x^3}{8} and y = 5x^3 + 8
  • Logarithm: y = 6 + 0.25\ln(x)
  • Exponential y = \frac{18}{1 + 6e^{-0.25x}}

<h3>How to describe the functions?</h3>

The functions are given as:

y = \frac{5x^3}{8}

y = 6 + 0.25\ln(x)

y = \frac{18}{1 + 6e^{-0.25x}}

y = 5x^3 + 8

The functions would be described based on the type of function they represent.

Functions that use the "ln" keyword are logarithmic functions, while functions that use the "e" keyword are exponential functions.

Read more about functions at:

brainly.com/question/4025726

#SPJ1

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2 years ago
5-minute call costs $5.91 and a 10-minute call costs $10.86. what is the rate of change
KatRina [158]

Answer:

0.96 cents

Step-by-step explanation:

3 0
3 years ago
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