Linear Combinations?

Solving system of equation by linear combinations of

2+4y=8

-5x+4y=1?
in Algebra 1 Answers by

Your answer

Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.
Anti-spam verification:
To avoid this verification in future, please log in or register.

1 Answer

I think the first equation should be 2x+4y=8.

So we have 2x+4y=8 and -5x+4y=1.

We can combine these as (2x+4y)-(-5x+4y)=8-1,

2x+5x=7, 7x=7, so x=1, substitute x=1 in either equation:

2+4y=8 or -5+4y=1, 4y=6, y=1½ or 3/2.

 

by Top Rated User (1.2m points)

Related questions

2 answers
how to solve linear combinations
asked Aug 29, 2012 in Algebra 2 Answers by anonymous | 1.0k views
0 answers
Linear Combinations?
asked Jan 21, 2012 in Algebra 1 Answers by anonymous | 647 views
1 answer
2x-3y=5 and -6x+9y=12
asked Jan 1, 2013 in Algebra 2 Answers by anonymous | 1.7k views
1 answer
How many even (E) and odd (O) combinations?
asked Jul 11, 2021 by BadWithNumbers Level 1 User (120 points) | 706 views
1 answer
all number combinations if there are two numbers and the numbers can be 1 through 6.
asked Apr 30, 2021 by 1000 IQ Detective | 429 views
Welcome to MathHomeworkAnswers.org, where students, teachers and math enthusiasts can ask and answer any math question. Get help and answers to any math problem including algebra, trigonometry, geometry, calculus, trigonometry, fractions, solving expression, simplifying expressions and more. Get answers to math questions. Help is always 100% free!

Most popular questions within the last 3000 days

  1. 50+50-25X0+2+2= (19)
  2. it takes 10 road workers 5 days to complete a road repair when working 2 hours a day.Working at the same pace,how many days will it take 2 people working 5 hours a day to finish it? (3)
  3. Solve 15 -1(12÷4+1)? (4)
  4. 8:4(5+2) (3)
  5. How can i represent 1/3; 3/3; 7/3; 10/3 and 15/3 on a number line? (1)

Most popular tags

87,516 questions
100,279 answers
2,420 comments
732,293 users