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Ugo [173]
3 years ago
6

Use the Echelon Method 1. Solve x + 3y = 7 3x + 4y = 11

Mathematics
1 answer:
Ludmilka [50]3 years ago
5 0

Answer:

x = 1     y = 2

Step-by-step explanation:

x + 3y = 7

- Subtract x from both sides.

3y = -x + 7

- Divide both sides by 3 to isolate the variable.

y = -1/3x + 7/3

- Plug the value of y into the other equation.

3x + 4(-1/3x + 7/3) = 11

3x - 4/3x + 28/3 = 11

- Add like terms.

5/3x + 28/3 = 11

5/3x = 5/3

x = 1

- Plug the value of x into the equation.

x + 3y = 7

(1) + 3y = 7

3y = 6

y = 2

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Can someone help me on this plzzz
Mumz [18]

Answer:

40

Step-by-step explanation:

x= 4 and y = 4

3x + 7y

3(4) + 7(4)

12 + 28

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6 0
2 years ago
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laila [671]
I think the answer is 4/12 or 1/3
7 0
3 years ago
Two equations are given below: a – 3b = 9 a = b – 3 What is the solution to the set of equations in the form (a, b)?
Vilka [71]
A-3b=9
a=b-3

b-3-3b=9
-2b-3=9
-2b=12
2b=-12
b=-6

a=-6-3
a=-9

Solution: (-9,-6)
----
Check: 
-9=-6-3
-9=-9
TRUE


7 0
3 years ago
Read 2 more answers
Rainfall in miami was measured during the month of june and is displayed in the following dot plot
Oksi-84 [34.3K]

Answer:

part A: Mean:6.42 Median:7

Part b: median

Part c: no it’s skewed left and unimodal

Step-by-step explanation:

3 0
3 years ago
Is this ordered pair a solution to the inequality?<br> (1, 3)<br> 5x+y&lt;-3<br> A.)No<br> B.)Yes
max2010maxim [7]
(1,3) means that x = 1 and y = 3. Let's make substitutions to see what happens with the inequality

5*x + y < -3
5*1 + y < -3 ... replace x with 1
5*1 + 3 < -3 ... replace y with 3
5 + 3 < -3
8 < -3

This is false. The number 8 is NOT smaller than -3. 

So (1,3) is NOT a solution

Answer: Choice A) No
3 0
3 years ago
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