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Karo-lina-s [1.5K]
3 years ago
10

6x + y = -39 3x + 2y = -15 elimination using multiplication

Mathematics
1 answer:
vlabodo [156]3 years ago
5 0
Multiply the second equation by 2 so that its 
6x+4y=-30
then subtract 
6x+y=-39
6x+4y=-30
= -3y=-69
divide by -3 to isolate the y
then you get y=23
substitute the y value back into one of the equations to solve for x.
6x+23=-31
solve like you always do and you'll get your x
Congratulations, you solved a problem.

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AnnyKZ [126]
<h3>Answer:</h3>
  1. no
  2. yes
  3. no
  4. yes
  5. yes
<h3>Explanation:</h3>

The distributive property is useful both for collecting terms and for eliminating parentheses.

1. 3x +1/4 -x +1 1/2 = x(3 -1) +(1/4 +1 2/4) = 2x +1 3/4 ≠ 4x +1 3/4 (no)

2. 2(3x+1) = 2·3x + 2·1 = 6x +2 = 2 +6x (yes)

3. 3(x+1) -(1+x) = (x+1)(3 -1) = 2(x+1) = 2x +2 ≠ 2x +3 (no)

4. 4(x+1)-x-4 = 4x +4 -x -4 = x(4-1) +(4-4) = 3x +0 = 3x (yes)

5. 5.5 +2.1x +3.8x -4.1 = x(2.1 +3.8) +(5.5 -4.1) = 5.9x +1.4 = 1.4 +5.9x (yes)

3 0
4 years ago
What is the missing number?<br>The possible answers are -19, 19, 24 and -15​
Paraphin [41]

Answer:

15 because it says -(-2) so that means it is negative in something so your answer will be 15

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
A 2 - a - 20 help me out please
mash [69]
Hey there,

By using the AC method . . . 

x^{2} +bx+c

We do (a^{2} -a-20) using the 
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answer would give us . . . 


(a-5) \ (a+4)

Hope this helps.
~Jurgen
4 0
4 years ago
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ArbitrLikvidat [17]

Answer:

f(4) = -11

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Step-by-step explanation:

here it asks to determine graphically, so we need to use the provided graph:

f(4) = -11 ( just notice the y-coordinate of the point of x-coordination 4)

If g(x) = 2 then x = 0 (just notice the x-coordinate of the point of y-coordination 2)

8 0
3 years ago
Which statement best describes what happens when k is changed from 2 to – 3
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Where are the statements
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