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Nastasia [14]
2 years ago
9

Solve the simultaneous equations 3x + y = 25 2x – y = 10

Mathematics
1 answer:
Darina [25.2K]2 years ago
4 0

Answer:

x=7 and y=4

Step-by-step explanation:

I will use the elimination method:

Since the co-efficient of both y's are the same number but different signs we add the 2 equations to eliminate the y:

3x + y =25
+     +     +

2x - y = 10

Simplify:

5x=35

Divide both sides by 5:

5x÷5=35÷5

Simplify:

x=7

Substitute this into either equation 1 or 2 ( I chose 1):

3(7) + y = 25

21 + y = 25

Subtract 21 from both sides and simplify to get y:

21+y-21=25-21

y=4

Therefore x=7 and y=4

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3 years ago
Solve this system of equations.
Dennis_Churaev [7]

Answer:

<em>x = -3 and y = 0</em>

Step-by-step explanation:

<em>It would be more direct to apply elimination in this problem, rather than substitution:</em>

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<em>Now let us solve for x through simply algebra:</em>

10x = -30,

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<em>Substitute this value of x into the first equation to get the value of y:</em>

2( -3 ) + 6y = -6,

-6 + 6y = -6,

  6y = 0,

    <em>y = 0</em>

4 0
3 years ago
Read 2 more answers
If a+b+c =0 show that a³+b³+c³= 3abc
slega [8]

Answer:

Step-by-step explanation:

a+b+c=0, a+b=-c,a+c=-b, b+c=-a

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7 0
3 years ago
What the word form 485,830
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Step-by-step explanation:

F=ma

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a=1000/200

a=5m/s^2

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