5x+6y+7z=178, 6x+4y+2z=124, then 3(x+y+z)=?ll

Can’t understand the basic linear equation
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

The second equation can be reduced to 3x+2y+z=62. Add this to equation 1:

8(x+y+z)=178+62=240, so x+y+z=240/8=30, and 3(x+y+z)=3×30=90.

by Top Rated User (1.2m points)

Related questions

1 answer
6x-3y+2z,-3x+2y-z,5x+6y-7z in vertical method
asked Jun 27, 2013 in Algebra 1 Answers by anonymous | 925 views
1 answer
6x-6y-4z=-10 -5x+4y-z=-12 2x+3y-2z=9
asked Oct 4, 2011 in Algebra 2 Answers by anonymous | 1.8k views
1 answer
solve for x,y,z. 3x-4y+2z -5x+3y+6z -6x+2y-8z
asked Dec 1, 2018 in Algebra 2 Answers by Kevin | 793 views
1 answer
solve for x+y=z=5 2x+4y+2z=6 -x+6y-3z=21
asked Nov 2, 2011 in Pre-Algebra Answers by anonymous | 1.8k views
1 answer
x-y+z=4, 2x-6y-3z=24, 3x-4y+2z=7
asked Oct 20, 2011 in Algebra 2 Answers by anonymous | 983 views
1 answer
6x-4y+2z=8 5x+2y+z=24 -3x+3y-3z=-12 by elimination
asked Nov 12, 2012 in Algebra 2 Answers by anonymous | 1.7k views
1 answer
z-{2z-[3z-(4z-5z)-6z]-7z}-8z
asked Feb 8, 2012 in Algebra 1 Answers by anonymous | 1.4k views
1 answer
7z-3x=18 & 2z-5x=1
asked Mar 22, 2012 in Algebra 1 Answers by anonymous | 754 views
1 answer
4y+3z=-7 12x-3y+z=-7 -6x+2y-2z=12
asked Feb 27, 2019 in Algebra 2 Answers by Tallent Level 1 User (300 points) | 1.5k views
1 answer
solve linear equation 6x-2y+2z=2, 4x+8y-2z=5, -2x-4y+z=-2
asked Oct 9, 2012 in Pre-Algebra Answers by anonymous | 1.4k views
2 answers
10x+5y+7z-5x+3z-6y=
asked Mar 21, 2015 in Algebra 1 Answers by Awesomeness | 944 views
1 answer
9x+3y+7z-5x+5z-6y
asked Dec 13, 2011 in Algebra 1 Answers by anonymous | 1.0k views
1 answer
If x-y=4 and z=6x-5-6y then z=?
asked Apr 16, 2018 in Algebra 2 Answers by anonymous | 1.0k 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
732,171 users