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3 years ago

If y varies directly as x and y=3 when x=2 find y when x=8

Mathematics

2 answers:

goldfiish [28.3K]3 years ago

8 0

Answer:

y = 12 when x = 8

Step-by-step explanation:

This is a case of direct variation, and the pertinent equation is y = kx.

Substituting 2 for x and 3 for y, we get: 3 = 2k. Then k = 3/2 is the constant of proportionality.

Then y = (3/2)x.

When x = 8, y = (3/2)(8) = 12

satela [25.4K]3 years ago

6 0

Answer:

Step-by-step explanation:

x=2 was multiplied by 4 to get to x=8 so you multiply y=3 by 4 to make it y=12

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3 years ago

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jeka57 [31]

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2 years ago

PLEASE HELP ME.....

Virty [35]

Answer:

They would meet each other at $01 : 24$ PM.

Step-by-step explanation:

Erik took a trip to see his friend Mike who lives 308 miles away.

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As Erik left his house at 10 AM driving at 70 mph and in 2 hours, his friend Mike left his place driving towards Erik at an average speed of 50 mph. It means

Erik left his place at 12:00 PM noon.

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Let 't' be the time when they meet

$70t\:+\:50t\:=168$

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$t=\frac{7}{5}$

$t=\frac{7}{5}=1.4\:\:hours$

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3 years ago

What is the value of b in the equation (yb) 4 = 1/24y

Amiraneli [1.4K]

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3 years ago

What are two expressions that are equivalent to 6(5j + 2 + j)?<br><br><br><br>

ziro4ka [17]

Answer:

1. 30j+12+6j

2. 36j+12

3. 6(6j+2)

Step-by-step explanation:

1. You just multiply so... 6x5j ... 6x2 ... 6xj

2. you multiply and then simplify so first you have 30j+12+6j, so you add like terms so... 30j+6j= 36j and then +12

3. you do what's in the parentheses first so 5j+j=6j so .... 6(6j+2)

5 0

3 years ago

If y varies directly as x and y=3 when x=2 find y when x=8​

If y varies directly as x and y=3 when x=2 find y when x=8