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Gre4nikov [31]
3 years ago
12

Using elimination solve x+4y=-8 and x-4y=-8

Mathematics
1 answer:
Vika [28.1K]3 years ago
8 0
Subtract the two equations: 8y=0 
y=0
x=-8
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What is the sum of the interior<br> angles of a polygon that has 7<br> sides?
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Answer:

900

Step-by-step explanation:

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3 years ago
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Graph the line that represents a proportional relationship between yyy and xxx where the unit rate of change of yyy with respect
Zigmanuir [339]

Answer:

axax are you in 7th grade math

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3 years ago
A test worth 125 points has 49 questions on it. Multiple Choice questions are worth 2 points each and short answer questions are
Charra [1.4K]

Answer:

There were 40 2-point questions and 9 3-point questions.

Step-by-step explanation:

To solve this situation, write two equations. One for the number of questions and one for the number of points.

Let x be the number of 2 point questions.

Let y be the number of 5 point questions.

x + y = 49

Now since x are each worth 2 points, the total points is 2x.

And since y are each worth 5 points, the total points is 5y.

So 2x + 5y = 125. Substitute one of the equations into the other to solve for the variables.

x + y = 49 becomes x = 49 - y. Substitute it.

2(49-y) + 5y = 125

98 - 2y + 5y = 125

98 + 3y = 125

3y = 27

y = 9

Substitute y = 9 back into the equation x = 49 - y to find x.

x = 49 - 9

x = 40

5 0
3 years ago
What is the sum of the given polynomials in standard form? (x2 – 3x) (–2x2 5x – 3).
Rina8888 [55]

Sum of standard form polynomials means adding the terms of same variable. The sum of the given polynomial in standard form is,

-x^2+2x-3

<h3>What is polynomial equation?</h3>

A polynomial equation is the equation in which the unknown variable is one and the highest power of the unknown variable is n.

Here, <em>n</em> is any real number.

In the polynomial equation the the terms are added or subtracted from each other only when the power of the variable is same.

Given information-

The first polynomial equations given in the problem is,

(x^2 - 3x)

The second polynomial equations given in the problem is,

(-2x^2+ 5x - 3).

To find the sum of these two polynomials, add the two terms together as,

(x^2 - 3x)+(-2x^2+ 5x - 3)

Let the result of the sum is f(x). Thus,

f(x)=(x^2 - 3x)+(-2x^2+ 5x - 3)\\f(x)=x^2-3x-2x^2+5x-3

Separate the similar power variable as,

f(x)=(x^2-2x^2)+(-3x+5x)-3\\f(x)=-x^2+2x-3

Thus the sum of the given polynomial in standard form is,

-x^2+2x-3

Learn more about the polynomial equation here;

brainly.com/question/2833285

7 0
2 years ago
How many of the following numbers are prime numbers? {7, 17, 27, 57, 77, 97, 117}
Natasha_Volkova [10]
All of them because they can't be multiply by nothing more than 1 Exept 27
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3 years ago
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