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JulijaS [17]
3 years ago
14

The variable x is twice the value of the variable y and the sum of x and y is 42 solve for x and y.

Mathematics
2 answers:
Lunna [17]3 years ago
8 0

Answer:

x=28     x=14

Step-by-step explanation:

x+y=42

2y=x

My method of doing this is a little unorthodox so this is probably going to make no sense... but here goes...

42/2=21

21*(2/3)=14

14*2=28

Oksi-84 [34.3K]3 years ago
4 0

Write two equations with the given information:

1) x = 2y ( x is twice the value of y)

2) x + y = 42

Replace x in the second equation with the value of x in the first equation:

2y + y = 42

Simplify:

3y = 42

Divide both sides by 3:

y = 42 / 3

y = 14

Now we have the value for Y, solve for x by replacing y with 14:

x = 2y

x = 2(14)

x = 28

X = 28 and y = 14

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In a cave, a stalactite gets 44 millimeters longer each year. this year it is 72 centimeters long. how many years until it is 1
iragen [17]

Answer:

6.36 years (the .36 repeats), so rounded is 6.4.

Step-by-step explanation:

First, I'm going to convert all measurements to meters.

Since 1000 mm = 1 m, divide 44 by 1000.

44/1000 = 0.044 m

Since 100 cm = 1 m, divide 72 by 100.

72/100 = 0.72 m

Next, I'm going to setup an equation using y = mx + b.

b is the beginning amount which is 0.72.

m in the equation represents the rate which is 0.044.

y represents the total which is 1.

Plugin the numbers and solve for x.

1 = 0.044x + 0.72

1 - 0.72 = 0.044x + 0.72 - 0.72

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7 0
2 years ago
What is the intercept form of the equation y=6x^2+12x-144
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Answer:

y = 6(x + 6)(x - 4).

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y = 6x^2 + 12x - 144

y = 6(x^2 + 2x - 24)     Factoring the trinomial in the parentheses ,we get:

y = 6(x + 6)(x - 4)

4 0
3 years ago
Please help!!!! ASAP!!!
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We see that 1/2 = 1/2, so 2/4 DOES equal 3/6.

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