![evanwall91](/avatars/2805.jpg)
evanwall91
03.02.2021 •
Mathematics
I am a bit confused, this is solving systems of equations by elimination.
Solved
Show answers
More tips
- L Leisure and Entertainment Unlocking the Secrets of Winning the Lottery...
- S Style and Beauty Ultimate Guide on How to Care for Suede Shoes...
- S Sport Running: How to Do It Right?...
- F Food and Cooking How to Cook Spaghetti Right – Secrets and Tips...
- P Philosophy Personal attitude towards Confession: how to prepare and undergo the procedure correctly?...
- H Health and Medicine Flu: How to Recognize It by the First Symptoms?...
- F Food and Cooking How to Sober Up Quickly? Important Facts and Tips...
- H Health and Medicine How to Properly Take a Blood Sugar Test?...
- H Health and Medicine Simple and Effective: How to Get Rid of Cracked Heels...
- O Other How to Choose the Best Answer to Your Question on The Grand Question ?...
Answers on questions: Mathematics
- M Mathematics Need help step by step plz...
- M Mathematics Why 3^-7 x 3^7 = 1. . Someone please...
- M Mathematics Next week your teacher will be giving you a chapter test. The test will consist on 35 questions. Some problems are worth 2 points and some are worth 4 points. There...
- M Mathematics Please answer quickly its for a TEST!!...
- M Mathematics 46:04 Which of the following describes the transformation of [x)=3(2)” +2 from the parent function 1x) = 2 reflect across the x-axis stretch the graph vertically by...
- M Mathematics What is x? -3(2x-7)+5=2x-9...
- M Mathematics Let P(A) = 0.27, P(B) = 0.58, P(A and B) = 0.21 Find the probability that either A or B will occur. Give answer to the hundredth place. (Example 0.87)...
- M Mathematics Solve [3(4-1)-7] - [6-(4-9)]...
- M Mathematics A school administrator bought 6 desk sets. Each set consists of one table and one chair. He paid $48.50 for each chalr. If he paid a total of $663 for the 6 sets,...
- M Mathematics You will prove that the sum of the measures of alternate interior angles in an inscribed angle...
Ответ:
y = -4
x = -2
Step-by-step explanation:
1. Approach
To solve a system by the process of elimination, one wants to manipulate an equation such that when one adds the equations in a system, one of the variables cancels out. The easiest way to do this is to select a variable, then find the LCM (least common multiple) of the two coefficients of the selected variables. Then multiply each of the equations by the respect factor that is needed to get the coefficient of the variable to the LCM. In the event that the cofficients do not have inverse signs, multiply one of the equations by (-1). No all that is left is to add the equations, use inverse operations to solve for the other variable, then back substitute to find the value of the selected varibale.
2.Set up the process
3x - 2y = 2
5x - 5y = 10
Selected variable; x
LCM of the coefficents (3, 5) = 15
Multiply the first equation by 5, and the second by 3
(3x - 2y = 2) *5
(5x - 5y = 10)*3
Resulting system
15x - 10y = 10
15x - 15y = 30
Now, multiply the first equation by (-1) to make the coefficents additive inverses
(15x - 10y = 10) (-1)
15x - 15y = 30
-15x + 10y = -10
15x - 15y = 30
3. Solving
Add the two resulting systems,
-15x + 10y = -10
15x - 15y = 30
-5y = 20
Inverse operations
-5y = 20
/-5 /-5
y = -4
Back solve
3x - 2y = 2
(3x) - 2(-4) = 2
Simplify,
3x + 8 = 2
Inverse operations,
3x + 8 = 2
-8 -8
3x = -6
/3 /3
x = -2
Ответ:
Positive association is, as the y values go up the x values go up as well
Negative association is, as the y values go up the x values go down, or vice-versa
No association is neither