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denis-greek [22]
3 years ago
15

Solve the system of equations.

Mathematics
2 answers:
Helen [10]3 years ago
8 0

Answer:

8x = 32

x = 4

y = 6

Step-by-step explanation:

2.5y + 3x = 27

5x – 2.5y = 5

_____________

8x = 32 (equation obtained after adding the two equations)

x = 32/8

x = 4

Plug x = 4 in 2.5y + 3x = 27

2.5y + 3*4 = 27

2.5y + 12 = 27

2.5y = 27 - 12

2.y5= 15

y = 15/2.5

y = 6

aliina [53]3 years ago
4 0

Answer:

I had this exact same question today in Algebra.

The answers are

1) 8x=32

2) (4,6)

I hope this helped!!!! Have a great day!

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X+y=3 x=6-4y using substitution
kenny6666 [7]

Givens

x + y = 3

x =6 - 4y

Solution

Use the top equation to substitute for x in the second equation.

x = 3 - y

Put this result into the second given equation and solve for y

3 - y = 6 - 4y        Add 4y to both sides.

3 - y + 4y = 6       Combine on the left

3 + 3y = 6            Subtract 3 from both sides

3 - 3 + 3y = 6 - 3  Combine

3y = 3                   Divide by 3

3y/3 = 3/3             Combine

y = 1                      

=========================

x + y = 3               but y = 1

x + 1 = 3                Subtract 1 from both sides.

x + 1 - 1 =3 - 1

x = 2

Answer

x = 2

y = 1

4 0
4 years ago
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PLZ HELP ITS DUE IN 28 MINUTES
Ilya [14]

Answer:

I think y and z = 45

4 0
3 years ago
Pls help me due soon
KIM [24]

Answer:

I'm pretty sure it b

Step-by-step explanation:

I think its b

5 0
3 years ago
Answer 2,3,4 for 25 points.
viktelen [127]

Answer:

2 is -1/3

3 is -6

4 is 2

Step-by-step explanation:

2 is 7x + 8x = 3x - 4

3 is 5x + (-3) = 2x + (-15)

4 is -4x + 17 = 6x -3

3 0
3 years ago
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If LN = 6x - 5, LM = x + 7, and MN = 3x + 20, find MN.<br> A.68<br> B.16<br> C.23<br> D.18
borishaifa [10]

Answer : The correct option is (A) 68.

Step-by-step explanation :

As we are given that:

LN = 6x - 5

LM = x + 7

MN = 3x + 20

Now we have to determine the value of MN.

According to the question:

LN = LM + MN

Now putting all the given values in this expression, we get:

6x - 5 = (x + 7) + (3x + 20)

6x - 5 = 4x + 27

6x - 4x = 27 + 5

2x = 32

x = 16

The value of MN = 3x + 20 = 3(16) + 20 = 48 + 20 = 68

Therefore, the value of MN is 68.

7 0
3 years ago
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