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Keith_Richards [23]
3 years ago
9

What does y equal. -4y+6y-5=9

Mathematics
1 answer:
Phoenix [80]3 years ago
4 0

Answer:

y = 7

Step-by-step explanation:

-4y+6y-5=9

Add -4y and 6y

2y-5=9

Move all terms not containing  y  to the right side of the equation.

2y=14

Divide both sides by 2

y=7

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1 year ago
A scientist needs to make 2 liters of saline solution (salt water), in which the salt level must be at 15% concentration (meanin
slamgirl [31]

Answer:

We need 1.6 liters of the 10 % concentration level and saline solution  and 0.4 liters of the 35 % concentration level and saline solution.

Step-by-step explanation:

Let V₁ be the volume of the 10% concentration saline solution required and V₂ be the volume of 35% concentration saline solution required.

Since mass = concentration × volume, the total mass of the 10% and 35% volume saline solution equal the mass of the 2 liter 15% volume solution.

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Also, the total volume of the 15 % solution must equal 2 liters. So,

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putting equation (3) into equation (1), we have

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we now put V₂ into (3), we have,

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V₁ = 1.6 liters

So, we need 1.6 liters of the 10 % concentration level and saline solution  and 0.4 liters of the 35 % concentration level and saline solution.

3 0
3 years ago
Give one example of an integer
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An integer is any positive or negative WHOLE number. So a few examples are 2, -4 and 7.
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