bri1710
02.11.2019 •
Mathematics
Solving linear systems of equations: addition (elimination method)
Solved
Show answers
More tips
- S Sport How to Do a Jumping Split...
- A Animals and plants What Do Terriers Eat?...
- F Food and Cooking Discover the Benefits and Properties of Dates...
- C Computers and Internet Dynamically Assigned IP Address: What Is It and How Does It Work?...
- S Style and Beauty How to Get Rid of Acne: Scientifically Proven Methods...
- H Health and Medicine Simple Ways to Lower Cholesterol in the Blood: Tips and Tricks...
- O Other How to Choose the Best Answer to Your Question on The Grand Question ?...
- L Leisure and Entertainment History of International Women s Day: When Did the Celebration of March 8th Begin?...
- S Style and Beauty Intimate Haircut: The Reasons, Popularity, and Risks...
- A Art and Culture When Will Eurovision 2011 Take Place?...
Answers on questions: Mathematics
- M Mathematics Complete the following statement. Use the integers that are closest to the number in the middle. 57...
- M Mathematics In this diagram, EA−→−⊥ ED−→− and EB−→− bisects ∠AEC . Given that m∠AEB = 4x + 1 and m∠CED = 3x, determine the missing measures....
- M Mathematics An article fills 1/2 of a page. A corresponding photo takes up 3/8 of the article. How much of the page is taken up by the photo...
- M Mathematics A gym has 2 Membership options, Option A, $5 per visit. Option B, pay $300 up front and $2 each visit. How many visits would it take to spend the same amount?...
- M Mathematics List the numbers in order from least to greatest: -4, -9/4, 1/2, 3.7,...
- M Mathematics The number of times a value is observed in a data set is called a...
- M Mathematics Los n├║meros racionales positivos se utilizan con gran frecuencia en situaciones cotidianas. Indica para que tipo de medidas no se utiliza....
- M Mathematics If f(x) = (x - 8)2. For x ≥ 8, find the inverse of f, f-1(x) A) x-9 B) x+9 C) x + 8 D) x- 9...
- M Mathematics Aunt Katrina just moved into a new house and wants to brighten up the dining room wall by hanging 6 of her favorite decorative plates. Each plate is 9 inches in diameter....
- M Mathematics -(m-3)=5m-(6m-7)-4 solve?...
Ответ:
multiply 2nd equation by -3
-3x + 15y = -51
3x + 2y = 0
add
17y = -51
y = -3
3x + 2y = 0
3x + 2(-3) = 0
3x = 6
x = 2
answer (2 , -3)
7)
multiply 2nd equation by -2
-2x -4y = -10
2x + 3y = 6
add
-y = -4
y = 4
2x + 3y = 6
2x + 3(4) = 6
2x + 12 = 6
2x = -6
x = -3
answer (-3, 4)
8)
multiply 1st equation by 2
6x -2y = 4
x + 2y =3
add
7x = 7
x = 1
x + 2y =3
1 + 2y =3
2y = 2
y = 1
answer (1,1)
9)
multiply 1st equation by 3 : 12x + 15y = 18
multiply 2nd equation by -2: -12x + 14y = 40
add
29y = 58
y = 2
4x + 5y = 6
4x +5(2) = 6
4x + 10 = 6
4x = -4
x = -1
answer (-1,2)
10)
multiply 2nd equation by 2
32x - 2y = 28
4x + 2y = 8
add
36x = 36
x = 1
4x + 2y = 8
4(1) + 2y = 8
2y = 4
y = 2
answer (1,2)
Ответ: