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telo118 [61]
3 years ago
15

Complete the solution of the equation. Find the value of y when x equals 15.

Mathematics
1 answer:
Mariulka [41]3 years ago
8 0

Answer:

y = -6   PLEASE GIVE BRAINLIEST

Step-by-step explanation:

-15 - 9y = 39

               39 + 15 = 54

-9y =54

y = 54 ÷ -9 = -6

y = -6

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How many times does 5 go into 2565?
Andreyy89
5 goes into 2565...... 513 times because 2656 divided by 5 equals 513 2565 / 5 = 513
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3 years ago
Dos motos, A y B, toman la salida en una carrera de 90 km. La moto A realiza el recorrido con una velocidad media inferior en 20
aleksandr82 [10.1K]

Answer:

motorcycle A: 180 km/h

motorcycle B: 200 km/h

Step-by-step explanation:

To solve this question we need to write a system of equations for A and B, using the equation:

distance = speed * time

The speed of A is 20 less than the speed of B, so:

speedA = speedB - 20

And the time A traveled is 3 minutes (0.05 hours) more than B's time, so:

timeA = timeB + 0.05

Then, using the distance equation, we have that:

distanceB = speedB * timeB

90 = speedB * timeB

distanceA = speedA * timeA

90 = (speedB - 20) * (timeB + 0.05)

90 = speedB * timeB + 0.05 * speedB - 20*timeB - 1

90 = 90 + 0.05 * speedB - 20*timeB - 1

20*timeB = 0.05 * speedB - 1

timeB = (speedB - 20)/400

using this timeB in the distance equation, we have:

90 = speedB * (speedB - 20)/400

90 * 400 = speedB^2 - 20*speedB

speedB^2 - 20*speedB - 36000 = 0

Solving this quadratic equation, we have speedB = 200 km/h

And the speedA is:

speedA = speedB - 20 = 200 - 20 = 180 km/h

6 0
3 years ago
672,591 is closer to 700,000 than
GaryK [48]
That number is closer to 700,000 than 185,505 for example, because it is a bigger number. Hope that makes sense.
7 0
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Answer:

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Step-by-step explanation:

Y= mx + b

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^^

Graph

4 0
3 years ago
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