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grin007 [14]
3 years ago
12

3x+2y=10 12x+5y=25 Solve by substitution or elimination

Mathematics
1 answer:
zaharov [31]3 years ago
5 0
3x + 2y = 10 ....multiply by -4
12x + 5y = 25
-------------------
-12x - 8y = -40 (result of multiplying by -4)
12x + 5y = 25
------------------add
-3y = - 15
y = -15/-3
y = 5

3x + 2y = 10
3x + 2(5) = 10
3x + 10 = 10
3x = 10 - 10
3x = 0
x = 0

solution is (0,5)
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La temperatura de un congelador bajó de 3 °C a −9 °C en 3 horas. Si la temperatura del congelador bajó en la misma cantidad de g
kolbaska11 [484]

Usando proporciones, se encuentra que al final de la primera hora, el congelador tenía una temperatura de -1ºC.

  • Este problema se resuelve por proporciones.
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La temperatura del congelador bajó en la <u>misma cantidad de grados cada hora</u>, o sea, en la primera hora, la cantidad que bajo es:

\frac{12}{3} = 4

4ºC bajo a 3ºC es:

3 - 4 = -1

O sea, al final de la primera hora, el congelador tenía una temperatura de -1ºC.

Un problema similar es dado en brainly.com/question/24617308

3 0
3 years ago
Factor 7w2−175.(1 point)<br><br> −7(w−25)<br><br> 7(w−25)<br><br> 7(w−5)(w+5)<br><br> 7(w−5)(w−5)
Nutka1998 [239]

Answer:

7(w + 5)(w -5)

Step-by-step explanation:

a² - b² = (a + b)(a - b)

7w² - 175 = 7w² - 7*25

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              = 7(w² - 5²)

              = 7(w + 5)(w -5)

6 0
3 years ago
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grin007 [14]

3 boys = $45

÷3 ÷3


$15, if they brought their own popcorn, then it's lose information, it's just there to throw you off


( ͡ ͜ʖ ͡ )

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pashok25 [27]

Answer:

b=6 1/4

Step-by-step explanation:

just trust me!!

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