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Elina [12.6K]
3 years ago
9

How do you solve the following system of equations by eliminating the y-values? I've already solved it by eliminating the x-valu

es so I know the answer is (-9/2, -10) but I'm having trouble getting that answer by eliminating the y-values.
2x-3y=21\\-6x+2y=7
Mathematics
1 answer:
AlexFokin [52]3 years ago
6 0

Step-by-step explanation:

The coefficients of the y terms are -3 and 2.  The least common multiple of 3 and 2 is 6.  So multiply the first equation by 2 and the second equation by 3, so that the y terms have a coefficient of 6.

4x − 6y = 42

-18x + 6y = 21

The signs are opposite, so add the equations together.

-14x = 63

x = -9/2

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PLEASE HELP ITS MATH THANK YOUUUU
viva [34]

Answer:

44 millimeters

Step-by-step explanation:

Because 99 meters divided by 9 = 11.

So, I multiplied 4 x 11 to get 44 millimeters.

Mark as brainliest PLZ. Thank you! It will help a lot!

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8 0
2 years ago
Read 2 more answers
A. 3<br> B. -3/4<br> C. -1<br> D. 2
yawa3891 [41]
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6 0
3 years ago
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HELP AGAIN PLEASE I TRIED IT ON MY OWN AND FAILED :(
Alex787 [66]

Answer:  ∠ J = 62° , ∠ K = 59° , ∠ L = 59°

<u>Step-by-step explanation:</u>

It is given that it is an Isosceles Triangle, where L J ≅ K J

It follows that ∠ K ≅ ∠ L

         ⇒ 5x + 24 = 4x + 31

         ⇒   x + 24 =         31

         ⇒   x         =           7

Input the x-value into either equation to solve for  ∠ K &  ∠ L:

∠ K = 5x + 24

      = 5(7) + 24

      = 35 + 24

       = 59

∠ K ≅ ∠ L  ⇒   ∠ L = 59

Next, find the value of  ∠ J:

∠ J +  ∠ K +  ∠ L = 180    Triangle Sum Theorem

∠ J  +   59  +  59 = 180

∠ J          + 118     = 180

∠ J                       = 62

8 0
3 years ago
A train covers a distance of 80 miles in 2 hours. At this rate, about how many hours will it take to cover a distance of 200 mil
Vadim26 [7]
Let's write miles over hours
80 / 2 = 200/ x
cross multiply
80x = 400
divide both sides by 80
x = 5

It will take 5 hours to cover 200 miles

Hope this helps :)
6 0
3 years ago
Find the midpoint of the line segment joining the points (5,6) and (-1,-6).
kumpel [21]

Answer:

The midpoint is (2,0)

Step-by-step explanation:

To find the x coordinate of the midpoint, add the x coordinates of the endpoint and divide by 2

(5+-1)/2 =4/2 =2

To find the y coordinate of the midpoint, add the y coordinates of the endpoint and divide by 2

(6+-6)/2 =0/2 =0

The midpoint is (2,0)

8 0
3 years ago
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