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Jlenok [28]
3 years ago
9

Plz help me answer this question

Mathematics
1 answer:
olya-2409 [2.1K]3 years ago
8 0
A. 5 invitations
b. 15 invitations
Comment if you need me to explain it.

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What is the solution to the system of equation 2x-y=7<br> Y=2x+3
Veronika [31]
<span><span>4x - y = -4</span>
<span><span>-y = -4 - 4x (subtract 4x from each side)
y = 4 + 4x (divide by -1)
y = 4x + 4 (commutative property of addition to get the x-value in front). 

Now we must plug what we have gotten y to equal into the other equation. If we try to plug what we have rearranged back into the original equation, we don't get anywhere. 

2x - y = -7
2x - 1(4x + 4) = -7 (substitution)
2x - 4x - 4 = -7 (distributive property with -1)
-2x - 4 = -7 (combine like terms)
-2x = -3 (add 4 to each side)
x = 3/2 (divide by -2). 

You</span></span><span>2x-y=7
Y=2x+3</span><span> have just solved for x! We can now plug what we have found for x into either equation to get what y equals. (If this is truly a system of linear equations, then it will not matter which one we use.) 

2(3/2) - y = -7 (substitution)

6/2 - y = -7 (multiplication)
3 - y = -7 (division)
- y = -10 (subtraction)
y = 10 (division) 

You have just found y! As a point, the solution to this system is (3/2, 10) with the x-coordinate first and the y-coordinate second. If we plug x and y into both equations, we will find that they will make the equations true. This is how we check ourselves. Using both equations: 

4x - y = -4
4(3/2) - 10 = -4 (does the left half equal -4?)
12/2 - 10 = -4
6 - 10 = -4
-4 = -4 (it does); 

2x - y = -7
2(3/2) - 10 = -7
3 - 10 = -7
-7 = -7. </span></span>
7 0
3 years ago
At the start of the month, the value of an investment was $48.45. By the end of the month, the value of the investment changed b
Klio2033 [76]
$34.65 because of 48.45-13.80
4 0
3 years ago
Is 168/54 in simplest form?
Brut [27]
No, because both can be divided by two. in simplist form it is 3 1/9
6 0
3 years ago
4535 divided by 83 = R =
Leto [7]

Answer:

54 R 53

54 53/83

Step-by-step explanation:

4535 divided by 83 equals

54 with a remainder of 53

8 0
3 years ago
The number of cars Gary sold each month was 12, 5, 9, 11, 14, and 10.
Minchanka [31]

Answer:

10.5

Step-by-step explanation:

Median is defined as the middle value- order the number from least to greatest ; if there is an even number of values, like in this case, order them from smallest to largest..... Add the two middle values and divide by 2..... The result is ur median

  1. 4,9<u>,10,11,</u>12,14
  2. 10+11=21
  3. 21÷2=10.5

7 0
3 years ago
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