MATHEMATICS MIDDLE SCHOOL

My sub was doing other things and not helpful and now I have homework I don't know how to do -5x+3y=19
-5x+7y=11

Answers

Answer 1
Answer: -5x+3y=19
-5x+7y=11

Here, we use substitution to solve for both variables. 

Solve for y first 

-5x + 3y = 19
+5x           +5x

3y = 19 + 5x 
y = 19/5 + 5/3x

Now plug that into the other equation.   -5x+7(19/5 + 5/3x) =11

-5x + 26.6 + 35/3x = 11
-5x + 35/3x = 20/3x

20/3x + 26.6 = 11
           -26.6    -26.6

11 - 26.6 = -15.6

20/3x = -15.6

x = -119.6

Ahhh, now time to solve for y

-5x+3y=19
-5(-119.6) + 3y = 19
598 + 3y = 19
-598            -598

19 - 598 = -579

3y = -579
y = - 193

WE ARE DONE!!!

Answer: y = -193 and x = -119.6

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When the sum of an unknown number z and twenty-two is divided by the same unknown number, the quotient is twelve. What is the unknown number?

Answers

Applying the definition of quotient and creating an equation, the value of the unknown number is: z = 2.

What is Quotient?

Quotient is the result you get when two numbers are divided with each other.

Thus:

Unknown number = z

Sum of z and 22 is: z + 22

(z + 22)/z = 12 (quotient)

Solve to find the value of z

z + 22 = 12z

22 = 12z - z

22 = 11z

22/11 = z

z = 2

Therefore, applying the definition of quotient and creating an equation, the value of the unknown number is: z = 2.

Learn more about quotient on:

brainly.com/question/11418015
(z+22)/z=12
z+22=12z
22=12z-z
22=11z
z=22/11=2

The distance (in miles) traveled when driving at a certain speed s for 24 hours, then driving 17 miles/hour faster for another hour. Express the distance in terms of s

Answers

The total distance in terms of 's' will be : (25s+17) miles

Explanation

We know that,  Distance= Speed* Time

So, the distance traveled at a speed of s miles/hour for 24 hours will be:  d_(1)= (s*24)miles = 24s miles.

Now, the speed is 17 miles/hour faster for another hour. So the speed for this another hour is (s+17)miles/hour

So, the distance traveled in this another hour =[(s+17)*1]miles = (s+17) miles

Thus, the total distance =[24s+(s+17)] miles = (25s+17) miles

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Answers

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The kitchen is square in shape and has an area of 441 square feet. What is the length, in feet, of one side of the kitchen.

Answers

square means equal sides, so that would be asking for what times itself = 441, like a square root, which would be 21

Is 2p=1/4p proportional ??

Answers

Answer:

It's non-proportional

Step-by-step explanation:

Three years ago, Jolene bought $750 worth of stock in a software company. Since then the value of her purchase has been increasing at an average rate of 12

2

5

% per year. How much is the stock worth now? (Round each money calculation you make to the nearest cent.)
please help

Answers

Ok, so if it has increased over three years by twelve percent, take .12 (12% in decimal form) and multiply it by 750 to get 90. Take 90 and multiply it by 3 to get 270. 270 is how much the value has increased over 3 years. So then just add 270 to 750 to get your answer of 1020. 1020 is how much the stock is worth after 3 years increasing at 12%. Just follow the same steps for 2% and 5% as I showed you with the 12%. 
As everyone says (lol) hope this helps :D
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