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GrogVix [38]
3 years ago
8

Estimate the solution to the system of equations.

Mathematics
2 answers:
Katen [24]3 years ago
7 0

Answer:

The solution is: x = -1, and y = 8/3

Step-by-step explanation:

Notice that the system of equations can be easily solved via the "elimination" method, by subtracting term by term one equation from the other. Doing such will remove completely the term in "y" (since the terms in "y" are exactly equal in both equations), and leave only an equation containing "x", for which the value can be solved:

2x+3y=6\\-4x+3y=12\\\\ \\2x-(-4x)+3y-(3y)=6-12\\6x+0=-6\\x=-1

Now we use this x-value in either equation to solve for y:

8090 [49]3 years ago
5 0
The answer is x=-1 y=8/3
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What missing number would complete the factorization k^2 + 5k + 6 = (k + 2) (k + ? )
timurjin [86]
The answer would be 3. 
<span>k^2 + 5k + 6 = (k + 2) (k + 3)

HOPE THIS HELPS! ^_^</span>
6 0
3 years ago
The midpoint of ab is M (-6,1 ). if the coordinates of A are (-7,-3 ),what are the coordinates of B
Scrat [10]

Answer:

B(-5,5).

Step-by-step explanation:

It is given that midpoint of AB is M (-6,1).  

Coordinates of A are (-7,-3 ).

We need to find the coordinates of point B.

Let coordinates of point B are (a,b).

Midpoint=\left(\dfrac{x_1+x_2}{2},\dfrac{y_1+y_2}{2}\right)

Midpoint of AB is

Midpoint=\left(\dfrac{-7+a}{2},\dfrac{-3+b}{2}\right)

(-6,1)=\left(\dfrac{-7+a}{2},\dfrac{-3+b}{2}\right)

On comparing both sides, we get

\dfrac{-7+a}{2}=-6

-7+a=-12

a=-12+7

a=-5

\dfrac{-3+b}{2}=1

-3+b=2

b=2+3

b=5

Therefore, the coordinates of B are (-5,5).

6 0
3 years ago
Can someone help please?
Serggg [28]

Answer:

lower bound: 315 litres

upper bound: 324 litres

Step-by-step explanation:

The following rules apply:

  • if the last digit of the number is 1, 2, 3, or 4; it is rounded down
  • if the last digit of the number is 5, 6, 7, 8, or 9. ; it is rounded up

So:

314 is  rounded to 310

315 is  rounded to 320

324 is  rounded to 320

325 is  rounded to 330

3 0
3 years ago
PLEASE HURRYY I AM BEGGING FOR HELP IVE BEEN STUCK FOR AN HOUR
saul85 [17]

Part A:

Look at the image attached to my answer for the graph of the inequalities.

There are two different lines provided, one with a more negative slope than the other. The shaded area between them represents the solution set.

The green line is 2x+y≤8, the blue line is x+y≥4

Part B:

To test if (8, 10) is included, substitute x = 8 and y = 10 into both inequalities. If it doesn't satisfy one of them, then it isn't included in the solution area.

2(8) + 10 ≤ 8

16 + 10 ≤ 8

26 ≤ 8... 26 is NOT less then or equal to 8

Thus, (8, 10) cannot be a solution since the inequality is not true.

Part C:

I'm going to choose a random point from the graph, (2, 3). For your answer, any point in the shaded region where both x and y is positive will work.

The point (2, 3) means that Sarah can buy 2 cupcakes and 3 pieces of fudge to get at least 4 pastries for her siblings while staying within her 8 dollar budget.

Let me know if you need any clarifications. Happy Studying~

3 0
3 years ago
In order for Brady to earn a B in his biology course, his test scores must average at least 80%. On the first 5 tests, he has an
larisa [96]

Hey there! I'm happy to help!

There were 5 tests needed to make an average of 77. These numbers have to add up to 385 (77×5) because that is what you divide by 5 to find the average which is 77.

Now, we want to find an average of 80 with 6 numbers. We multiply 80 and 6, showing us that the sum of these 6 numbers must be 480. Since 5 of these numbers are the same as with the 77 average, we know that one test score (the one Brady needs to get) is added to 385 to give us 480.

480-385=95

Therefore, Brady needs to earn a 95% on the last test to receive a B in the class.

8 0
3 years ago
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