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3 years ago

Solve x − 2y = 3 for x

Mathematics

1 answer:

sammy [17]3 years ago

3 0

Answer:

x=2y+3

Step-by-step explanation:

x − 2y = 3

x=2y+3

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If twice a number is at least three less than four times the number, which of the following are true? Let n represent the number

NikAS [45]

Answer:

Step-by-step explanation:

Let n represent the number

Twice the number =2n

4 times the number = 4n

Given that twice the number is atleast 3 less than four times the number

Algebraically this can be written as

2n≤4n-3

We can add 3 to both sides

So n should be atleast 1.5

If n is natural number or integer then least value of n is 2.

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Based on the graph, which inequality is correct for a number that is to the right of -3?

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If Tom rides at a speed of 18 mph, and Juanita rides at a speed of 14 mph, how far apart will they be in 2 hours?

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3 years ago

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The jogging track at Francine’s school is 3/4 mile long. Yesterday Francine completed two laps on the track. If she ran 1/3 of t

Galina-37 [17]

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4 years ago

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One canned orange juice is 25% orange juice another is 5% orange juice. How many liters of each should be mixed together in orde

Cerrena [4.2K]

Answer:

$X = \frac{1.6 - 0.05Y}{0.25}= 6.4 -0.2 Y$ (3)

Replcaing equation (3) into equation (2) we got:

$0.75(6.4 -0.2 Y) +0.95 Y = 18.4$

And solving for Y we got:

$4.8 -0.15 Y +0.95 Y = 18.4$

$0.8 Y = 13.6$

$Y = 17$

And solving for X from equation (3) we got:

$X= 6.4 -0.2*17 = 3$

So we need 3L of orange juice with 25% of concentration and 17 L of orange juice with 5% of concentration

Step-by-step explanation:

For this problem we can work with the concentration of water and orange juice.

Let X the amount for the orange juice with 25% content and Y the amount for the orange juice with 5% of content

Using the concentration of orange juice we have:

$0.25 X + 0.05 Y = 20*0.08$ (1)

And for the water we have:

$0.75 X + 0.95Y = 20*0.92$ (2)

If we solve for X from equation (1) we got:

$X = \frac{1.6 - 0.05Y}{0.25}= 6.4 -0.2 Y$ (3)

Replcaing equation (3) into equation (2) we got:

$0.75(6.4 -0.2 Y) +0.95 Y = 18.4$

And solving for Y we got:

$4.8 -0.15 Y +0.95 Y = 18.4$

$0.8 Y = 13.6$

$Y = 17$

And solving for X from equation (3) we got:

$X= 6.4 -0.2*17 = 3$

So we need 3L of orange juice with 25% of concentration and 17 L of orange juice with 5% of concentration

7 0

3 years ago