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Igoryamba
3 years ago
12

What is the solution to the system of equations 2x-5y=-5 and x+2y=11?

Mathematics
1 answer:
AnnZ [28]3 years ago
4 0
Let's eliminate x in the system 

<span>
 2x-5y=-5
 x+2y=11

To do this, mult. the 2nd eqn by -2:

</span> 2x-5y=-5 
 -x-4y=-22
---------------
   -9y= -27.  This yields y = 3.

Now subst. 3 for y in either of the original equations to determine x.

Write your answer as an ordered pair:  ( ?  , 3).
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At a shelter, 5% of the dogs are puppies. There are 1,880 dogs at the shelter. How many are puppies?
Tanya [424]

Answer:

94

Step-by-step explanation:

3 0
3 years ago
Describe and correct the error a student made in finding the midpoint cd with c(-4,5) and d(-1,-4).
Gnesinka [82]

Answer:

Step-by-step explanation:

The formula for finding the midpoint of two coordinates is expressed as;

M(X,Y) = (\frac{x_1+x_2}{2} , \frac{y_1+y_2}{2})

Given the coordinates c(-4,5) and d(-1,-4), x1 = -4, y1 = 5, x2 = -1 and y2 = -4.

For the X coordinate of the midpoint

X = x1+x2/2

X = -4+(-1)/2

X = -4-1/2

X = -5/2

X = -2.5

Similarly for Y:

Y = y1+y2/2

Y = 5+(-4)/2

Y = 5-4/2

Y = 1/2

Y = 0.5

Hence the midpoint coordinate of C(-4,5) and D (-1,-4) is (-2.5, 0.5)

5 0
3 years ago
Need help <br><br>True or False
EleoNora [17]

The answer to this question is false because it cannot still be both negative after you reflect over two positives.

7 0
4 years ago
Help needed math 3 - 10 points read closely
inessss [21]
<h2>Hello!</h2>

The answer is:

The answer is the fourth option,

f(-3)=-\frac{1}{3}

<h2>Why?</h2>

Piecewise functions are functions that are composed by two or more expressions, the expression to use will depend of the domain or input that we need to evaluate.

We are given the piecewise function:

\left \{ {{\frac{1}{x}, if x

There, we know that:

We should use the first expression if the value to evaluate is less than -2.

So, for this case, the function will be:

f(x)=\frac{1}{x}

We should use the second expression if the value to evaluate is greater or equal than 2.

So, for this case, the function will be:

f(x)=x^{2}

Now, since we are given that the value to evaluate is -3, and its less than -2, we need to use the first expression, and evaluate it.

-3

So, evaluating the function we have:

f(x)=\frac{1}{x}

f(-3)=\frac{1}{-3}

f(-3)=-\frac{1}{3}

Hence, we have that the answer is the fourth option,

f(-3)=-\frac{1}{3}

Have a nice day!

7 0
3 years ago
What is the absolute value of 6.75?
dusya [7]
6.75 is the absolute value of 6.75 absolute value is distance from zero and 6.75 is 6.75 from 0 so is -6.75
6 0
3 years ago
Read 2 more answers
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