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Luba_88 [7]
3 years ago
12

Use the elimination to solve this equation. 2x+3y=55 9x+4y=105

Mathematics
1 answer:
seropon [69]3 years ago
6 0
X=5 y=15 (5,15). 
This is how you do it:
-4(2x+3y=55): -8x-12y=-220
3(9x+4y=105):27x+12y=315

You add the two new equations together, canceling out the y values, and get the x value. Then, you go back and plug in the x value in the original equation to get the y value.

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If the circumference of two circle are in the ratio 2:3, then their areas are in the ratio of
maxonik [38]

Answer:

4:9

Step-by-step explanation:

To take the scale factor from distance to area, we square it

2:3  distance

Square each term

2^2 : 3^2  area

4:9

6 0
3 years ago
Para reunir dinero para su gira de estudios , los alumnos de un curso deciden vender números de una rifa que se encuentran numer
QveST [7]

Respuesta:

0.53

Explicación:

Para calcular la posibilidad del evento A: "ganar la rifa comprando todos los números múltiplos de 3 o 5", debemos usar la siguiente fórmula.

P(A) = casos favorables / casos posibles

Evaluemos primero todos los casos que son múltiplos de 3, entre 1 y 100: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90, 93, 96, 99. En total son 33.

Ahora, evaluemos todos los casos que son múltiplos de 3, entre 1 y 100: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100. En total son 20.

El número total de casos favorables es 33 + 20 = 53.

El número de casos posibles es el total de números de 1 a 100, es decir 100.

Luego P(A) = 53/100 = 0.53.

7 0
3 years ago
Brady is selling candy bars for a school fundraiser to help pay for new sports uniforms. He gets paid $2 for every candy bar he
swat32

Answer:

Second option: 2x=90

Step-by-step explanation:

Let be "x"  the number of candy bars Brady sold on Saturday.

For this exercise you need to analize the information provided in the exercise.

According to the information provided, Brady gets paid $2 for every candy bar he sells. This can be expressed as:

2x

 You know that Brady made a total of $90 on Saturday; this mean the product of  2x is 90.

Based on this, you can write the following equation that represents the number of candy bars Brady sold on Saturday:

2x=90

Observe that this matches with the second option.

6 0
3 years ago
Simple question l just don’t know how to do it
Nutka1998 [239]
This question in simplest form would be 2
√7
3 0
3 years ago
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Damielos cheated and there is so much proof vvv
Nataliya [291]

Answer: sounds interesting

Step-by-step explanation:

5 0
3 years ago
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