# Algebra 2

i need help solving the problem
3x+y=-1
2x+3y=18
using substitution

1. 👍 0
2. 👎 0
3. 👁 100
1. 3x+y=-1
y = -1 -3x

2x+3y=18
2x + 3(-1-3x) = 18
2x - 3 - 9x = 18
-7x = 21
x = -3

Substitute -3 for x in the first problem to find the value of y.

1. 👍 0
2. 👎 0
2. matrix[2x,0
4,-y]=matrix[4,0
4,1]

1. 👍 0
2. 👎 0

## Similar Questions

What advantages does the method of substitution have over graphing for solving systems of equations? Choose the correct answer below. A. Graphing cannot be used to solve dependent or inconsistent systems due to the nature of the

asked by zwgz123 on December 15, 2017
2. ### Math

1. Explain the advantages and disadvantages of both the substitution method and the elimination method for solving a system. Help please. The only reasons I can think of is because in substitution it might be more difficult cause

asked by Amanda on February 18, 2008
3. ### Career planning

Which of the following is an effective first reaction to a problem . A. Asking questions to help you understand the problem B. Deciding on a solution as quickly as possiable C. Finding someone else to handle the problem D.

asked by Kayla on May 20, 2019
4. ### Algebra

When is the substitution method a better method than graphing for solving a system of linear equations?

asked by Cassidy on January 28, 2013
5. ### algebra

Explain the difference between solving a system of equations by the algebraic method and the graphical method. Someone also wants to know why there are different methods for solving the same problem-what would you tell him?

asked by kiMBERLY on July 12, 2010
1. ### Computer

Diagnosing is solving the problem, and troubleshooting is figuring out what the problem is. True False

asked by Lee on September 22, 2017
2. ### math

Note: You can get full credit for this problem by just answering the last question correctly. The initial questions are meant as hints towards the final answer and also allow you the opportunity to get partial credit. Consider the

asked by kitor on January 25, 2014
3. ### Calculus

Which of the following would be the best first step when solving the following system using the substitution method? x - y = -4 ; x + 2y = 5 a. x = -4 - y b. x = -4 + y c. 2y = 5 - x d. 2y = 5 + x

asked by Iris on November 9, 2016
4. ### Calculus

I am having trouble solving this problem: "Find where the tangent line is horizontal for r=1+cos(theta)" I would really appreciate the feedback, I'd like to know how to go about solving problems like these. Thank you!

asked by Anonymous on March 1, 2013
5. ### statistics

in a classic study of problem solving, katona demonstrated that people whoa re required to figure out a problem on their own will learn more than people who are given the solution. One group of participants is presented with a

asked by Lezlie on June 11, 2008
6. ### College Math

I need help solving these problems by using the substitution problem 2x-3y=16 5x+2y=21

asked by Cam on March 20, 2013