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ANEK [815]
3 years ago
10

2x + y = 20 6x - 5y =12

Mathematics
2 answers:
Vera_Pavlovna [14]3 years ago
7 0
Rearrange the first equation
2x + y = 20
take away 2x from both sides
y = 20 - 2x 
substitute this y value into the second equation
6x - 5(20 - 2x) = 12
6x -100 +10x = 12
add 100 to both sides
6x + 10x = 112
16x = 112
divide both sides by 16 
x = 7
Substitute this x value into the first equation to get y.
2(7) + y = 20
14 + y = 20
take away 14 from both sides
y = 6

So, y = 6 and x = 7
nika2105 [10]3 years ago
6 0
5(2x + y = 20) = (10x + 5y = 100)
(10x + 5y = 100) + (6x - 5y = 12) = 16x = 112
112/16 = 7

The final answer is 7.
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=> 3x - x = 5 + 3

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2 years ago
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Acuve
emmasim [6.3K]

Answer:

choice C

Step-by-step explanation:

First, you need to know that this is the Fibonacci Sequence, a series of numbers: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ... where the next number is found by adding up the two numbers before it.

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8 0
4 years ago
C is the midpoint of line segment AB Find the value of x, if line segment AB = 5x and line segment AC = 20.
Softa [21]
D.8

A and C are out because they would get you ether lower or equal to 20, which is equal to AC and your trying to find X in AB which is so posed to be the what equals AC+BC.
AB=AC+BC
5x=20+BC
5(8)=20+BC
40=20+BC
40=20+20

AC equals 20. AB will have to equal AC+ CB. If you put in A.4 in AB 5X you will get twenty and that not what you want. You want to get a number that will get you the an answer greater to AC. So 5(8)=40. 
5 0
3 years ago
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