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3 years ago

−5y+3x=3 −8y+9x=−12 What is X and Y please.

Mathematics

2 answers:

Tomtit [17]3 years ago

4 0

Answer:

( -4, -3 )

Step-by-step explanation:

Let's solve by elimination. Reason being there are no variables without coefficients.

−5y+3x=3 Multiply equation by 3. Each term.

−8y+9x=−12

-15y + 9x = 9 Subtract the to equations

-8y + 9x = -12

___________

-7y = 21

y = -3

Substitute y into original equation

-5(-3) + 3x = 3

15 + 3x = 3 Subtract 15 both sides

3x = -12 Divide by 3, both sides

x = -4

Yuri [45]3 years ago

4 0

Answer:

y=-3

x=-4

Check:

-5(-3)+3(-4) =3

15-12=3

3=3 ✅

-8(-3)+9(-4)=-12

24-36=-12

-12=-12✅

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andreyandreev [35.5K]

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584.57

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3 years ago

Find the quotient of -85^2-27n+76 / -17n-19

bagirrra123 [75]

Answer:
5n-4

Explanation:
The given expression is:
$\frac{-85n^2-27n+76}{-17n-19}$

1- Take the negative as a common factor from both the numerator and the denominator. This will give us:
$\frac{-(85n^2+27n-76)}{-(17n+19)}$

2- Cancel out the negative sign (common factor) from the numerator and denominator. This will give us:
$\frac{(85n^2+27n-76)}{(17n+19)}$

3- Factor the numerator. This wil give:
$\frac{(5n-4)(17n+19)}{(17n+19)}$

4- Finally, cancel out the (17n+19) which common in both numerator and denominator. This will give us the final expression:
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Hope this helps :)

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3 years ago

A soccer team won 30% of their games and won 40 games. how many games did they play?

sweet [91]

Answer:

Step-by-step explanation:

i added 30% and 40

6 0

3 years ago

Greg studied for 12 minutes. This is 40% of the time he wants to study today. How many more minutes does Greg need to study toda

dolphi86 [110]

Answer:

18 More Minutes

Step-by-step explanation:

Hi,

I think I can help.

What I would first do here is try to find the value of 10% relative to the 12 minutes. If we find what 10% is we can multiply that to get 100% to find the total amount of minutes he wants to study. We can then subtract the time already studied to find our answer.

To do this we want to take the 40% we have and find 10. We can do 40/4 to find this since 40 divided by 4 is actually 10.

But if we do this we also have to do with to the number it is relating to / representing. Which is 12. (12 minutes = 40%)

So we can do :

40 / 4

10%

Also

12 / 4

So with this we can conclude that 10% of his total time is 3 minutes.

Now lets multiply this by 10 to get the 100% we are looking for so we can get the total amount of time he spent studying.

So :

10% x 10

100%

3 x 10

30 minutes

So his total time is 30 minutes of studying, but we have to find how many more minutes after his 12.

We can now simply take the total time and take off the time spent already to find this answer :

30 - 12

18 minutes

That is your answer, he needs to study 18 more minutes.

I hope this helps!

If you have any questions or concerns please comment or message me! :)

7 0

2 years ago

Find the center and radius of the circle x2+(y+8)2=4

VARVARA [1.3K]

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The standard equation of a circle is (x-h)² + (y-k)² = r² where (h,k) is the center and r is the radius.

You can write the equation as (x-0)² + (y-( -8))² = 2². From this, you can conclude that the center is (0,-8) and the radius is 2.

4 0

3 years ago

−5y+3x=3 −8y+9x=−12 ​ What is X and Y please.

−5y+3x=3 −8y+9x=−12 What is X and Y please.