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Scorpion4ik [409]
2 years ago
11

You are given two algebraic equations, y = 3x, and 2y = x + 20. Solve for x and y.

Mathematics
1 answer:
Yuri [45]2 years ago
7 0

Answer:

x= -4 & y=-12

Step-by-step explanation:

multiply y=3x by 2

giving you 2y=6x

subtracting 2y=x+20 from 2y =6x

=> 5x=-20

dividing through by 5

=> x=-4

put x=-4 into y=3x

=> y=3(-4)

<em>y</em><em>=</em><em>-12</em>

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Step-by-step explanation:


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2 years ago
Evaluate. 7^2 - 3 + 9 × 8 ÷ 2<br><br> w =
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Answer:

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Step-by-step explanation:

3 0
2 years ago
The temperature, t, in degrees Fahrenheit, can be found by counting the number of cricket chirps, c, heard in 14 seconds and the
dem82 [27]
Answers:
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- A viable solution is (10, 50)


- All values of t must be positive. 
EXPLANATION
t, temperature (in Fahrenheit) is dependent on c
c is the number of cricket chirps heard in 14 seconds
Therefore, all values of c must be positive integers
If all values of c must be positive integers
Then all values of t must also be positive integers

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EXPLANATION
t = c + 40
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If c = 10
t = 10 + 10
t = 50
Therefore a viable solution is (10, 50)

EXPLANATION FOR WHY OTHER OPTIONS ARE WRONG:
- The graph is continuous. 
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- A viable solution is (–2, 38)
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- A viable solution is (0.5, 40.5)
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5 0
2 years ago
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8 0
3 years ago
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