1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
storchak [24]
3 years ago
14

Determine the best method to solve the system of equations. Then solve the system.

Mathematics
2 answers:
maxonik [38]3 years ago
8 0

Answer:

x=1  y = -1/2

(1,-1/2)

Step-by-step explanation:

7x-2y=8  

5x+2y=4

I would use elimination since we have 2y in one equation and -2y in the other

7x-2y=8  

5x+2y=4

--------------------

12x = 12

Divide each side by 12

12x/12 = 12/12

x =1

The substitute back into equation 2

5(1) +2y = 4

5 +2y = 4

Subtract 5

5-5+2y = 4-5

2y = -1

Divide by 2

2y/2 = -1/2

y = -1/2

Artist 52 [7]3 years ago
5 0

Answer:

The best method is the elimination method. The solution is (1, -1/2).

Step-by-step explanation:

7x - 2y = 8

5x + 2y = 4

12x = 12

x = 1

7(1) - 2y = 8

7 - 2y = 8

-2y = 1

y = -1/2

Make sure to write the answer in the form of an ordered pair.

Note: Alternative methods are graphing and the substitution method.

You might be interested in
Consider the quadratic equation: 5x2 + 2x + 1 = 0. 1) Which statement is true about the roots of the given quadratic equation? A
IRINA_888 [86]

Hello!

In math, there is always something called the discriminant. This is represented by the equation b^{2} -4ac, when a quadratic = ax^{2} + bx + c. The discriminant tells you what roots an equation has. A discriminant of over 0 represents 2 real roots, a discriminant of 0 = 1 real root, and a discriminant of <0 is 0 real roots (2 complex roots)

Now, substitute in the values and solve. In this equation, a = 5, b = 2, c = 1.

b^{2} -4ac

2^{2} -4(5)(1)

4 - 20

-16

Therefore, the discriminant is -16. This means that the equation has no real roots, and has 2 complex roots. Therefore, your answer is D.

Hope this helps!

5 0
3 years ago
Which represents the solution(s) of the equation x2 = 49?
Lady_Fox [76]

Answer: 7,-7

Step-by-step explanation: 7 squared is 7 times 7 which equals 49

-7 times -7 is also 49 bc the negatives cancel each other out

8 0
3 years ago
Read 2 more answers
18⅔ ÷ ⅔ <br>how many children are there?<br>​
kiruha [24]
The answer is 28

Explanation:


18⅔ ÷ ⅔

= 56/3 ÷ 2/3
= 56/3 x 3/2

= 56/2

=28
4 0
2 years ago
I Need The Answer Plz!!! Geometry Is Hard!!!
Scorpion4ik [409]

Answer:

B. 10

Step-by-step explanation:

First, we need to recognize that the two triangles are similar (the triangle with a leg value of 21 and the triangle with a leg value of 4 and hypotenuse x)

Let's first label the leg of the second triangle as y.

Then, we can set up this equation

\frac{21}{y} =\frac{y}{4}

Cross multiplying gives us

84=y^2

So, y=sqrt(84) or 2 sqrt(21).

Now, using the pythagorean theorem, we get

4^2+2sqrt(21)^2=x^2

100=x^2

x=10

4 0
3 years ago
The following is the prime factorization of which composite number? 2 to the 2nd power times 3 to the 2nd power times 5
Sidana [21]
2 to the 2nd power times 3 to the second power times 5

4 X 9 X 5 = 36 X 5 = 180

so the answer is 180


hope this helps
7 0
3 years ago
Other questions:
  • Please Help...
    6·2 answers
  • 70 Points!! Question!​
    7·2 answers
  • Find a solution for the equation y = 4x - 3.
    13·1 answer
  • 1. If one zero of the quadratic polynomial kx² + 3x + k is 2 then the value of k is *
    14·1 answer
  • Sam can wash 8 cars is in 1 hour. Shelley can wash 6 cars in 1 hour. How much time does it take them to wash 70 cars if they wor
    5·1 answer
  • Dave has had a gym membership for 10 weeks. He goes to the gym 5 times a week. Each visit, he exercises for 1.75 hours. He spend
    9·1 answer
  • Evaluate the following.<br><br><br> |5|-9=<br><br> |5-9|=
    10·1 answer
  • house prices in the neighborhood average at 76.80 per square foot. if the house has 1250 square feet, what should be its price?
    13·1 answer
  • Pls help fast i need help
    8·2 answers
  • Your math teacher instructed you to draw a square with 16 cm perimeter, she then asked you to connect the midpoints of its side
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!