MATHEMATICS MIDDLE SCHOOL

Plz help me get the right answer to these

Answers

Answer 1

Answer:

-8(-4) + y = 37

32 + y = 37

y = 5

when x = -4, y = 5

Answer 2

Answer: if -4 is the value for x, you would multiply -8 by -4
this should get you positive 32 because - and - equals a positive
now you have
32 + y =37
subtract 32 from both sides to get
y=5
hope this helped

Related Questions

Are the ratios 3/5 and 9/15 proportional?How do you know?

Answers

Yes. 5*3=15 and 3*3=9. They are proportional because if you multiply the top and the bottom of the first fraction by the same number and you get the second number they are proportional.

What is the LCD for the fractions 5/6 and 3/8 PLZ HURRYa. 14

b. 18

c. 24

d. 48

Answers

The least common denominator for the fractions 5/6 and 3/8 is 24. 6 x 4 = 24, 8 x 3 = 24.

An industrial cleaner is manufactured using only the 3 secret ingredients A, B, and C, which are mixed in the ratio of 2:3:5, respectively, by weight. How many pounds of secret ingredient B are in a 42-pound (net weight) bucket of this cleaner?A. 4.2
B. 12.6
C. 14.0
D. 18.0
E. 21.0

Answers

Answer: The correct option is (B) 12.6.

Step-by-step explanation: Given that an industrial cleaner is manufactured using only the 3 secret ingredients A, B, and C, which are mixed in the ratio of 2 : 3 : 5 respectively, by weight.

We are to find the number of pounds of the secret ingredient B that are in a 42-pound bucket of this cleaner.

Let the quantities of the ingredients A, B and C in the cleaner be 2x, 3x and 5x respectively.

Then, according to the given information, we have

$2x+3x+5x=42\n\n\Rightarrow 10x=42\n\n\Rightarrow x=(42)/(10)\n\n\Rightarrow x=4.2.$

Therefore, the quantity of the ingredient B is given by

$3*4.2=12.6~\textup{pounds}.$

Thus, option (B) is CORRECT.

The ratios add up to 10 so 42/10 is 4.2 and as b is 3parts you times 4.2 by 3 giving you 12.6

4x + 12 = -7y
-y + 12 = 4x
Solve with elimination

Answers

Take the second equation and flip it around so the y on the left ends up on the right and the 4x on the right ends up on the left. This makes all negatives positive and all positives negative. -4x + 12 = y

Then add the first equation to the second equation
4x +12 = -7y
-4x + 12 = y this eliminates the x's
24 = - 6y then divide by - 6
- 6 - 6
- 4 = y

So if you know that y = negative 4, you can substitute into either equation. I pick the second one because I am a lazy person.
-y + 12 = 4 x
-(-4) + 12 = 4 x combine your numbers
16 = 4 x then divide by 4
4 = x
So your solution is: x = 4 and y = -4 or this is also written (4, -4)

Does that work for you?

$\begin{cases}4x + 12 = -7y \n -y + 12 = 4x \end{cases} \n \n\begin{cases}4x + 7y = -12 \n -4x-y =-12 \end{cases} \n+ ------- \n6y=-24\ \ /:6\n \ny=-(24)/(6)\n \ny=-4$

$4x+12=-7y\n \n 4x+12=-7*(-4)\n \n4x=28-12\n \n4x=16\ \ /:4\n \nx=(16)/(4)\n \n x=4 \n \n \begin{cases}x=4 \n y=-4 \end{cases}$

Brass is an alloy made from copper and zinc in the ratio 3:2, based on weight. If 120g of copper are needed for a certain piece of brass, how much zinc will be needed for the same piece?

Answers

If 120g of copper are needed for a certain piece of brass, then the weight of the zinc that will be needed for the same piece is 80 grams.

What is a Ratio?

A ratio expresses the number of times one number contains another. For example, if a dish of fruit contains eight oranges and six lemons, the orange-to-lemon ratio is eight to six. Similarly, the lemon to orange ratio is 6:8, while the orange to total fruit ratio is 8:14.

Given that Brass is an alloy made from copper and zinc in the ratio 3:2, based on weight. Therefore, the ratio of the metals can be written as,

Copper / Zinc = 3/2

Now, as the weight of the copper is 120grams. Therefore, the ratio can be written as,

Copper / zinc = 3/2

120 grams / zinc = 3/2

zinc = (120 grams × 2) / 3

zinc = 80 grams

Hence, If 120g of copper are needed for a certain piece of brass, then the weight of the zinc that will be needed for the same piece is 80 grams.

Learn more about Ratios here:

brainly.com/question/1504221

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The answer is 80.
You would first, divide 120 by 3.
Then, multiply 40 by 2.

What's the missing term and missing coefficient of (6a - blank )5a= blank a^2 - 35a

Answers

first blank = 7 (because 7*5a=35a)
second blank = 30 (because 6a*5a=30a^2)

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