4a+b=72, 6a+9b=102 fin the values of a and b

can you help me find the values of a and b
in Algebra 2 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

4a+b=72 ....(i)

6a+9b=102....(ii)

from (i), b=72-4a

substitute it into (ii)

6a + 9(72-4a)=102

6a +648 -36a=102

-30a=-546

a=18.2

from (i), b=72-4a

thus b=72-(4*18.2) =-0.8

a=18.2  , b=-0.8

by Level 2 User (1.9k points)

Related questions

1 answer
-7b+4a-6a-9b how to solve
asked Feb 1, 2014 in Pre-Algebra Answers by anonymous | 1.0k views
1 answer
(3.4a – 1.7b) + (2.5a – 3.9b)
asked Sep 6, 2017 in Algebra 2 Answers by anonymous | 1.1k views
1 answer
(4a^3-4a^2)+(6a^3+5a^2)
asked Apr 30, 2018 in Algebra 1 Answers by anonymous | 451 views
1 answer
6a+4b+8+3b-4a+9
asked Aug 22, 2013 in Algebra 1 Answers by anonymous | 803 views
1 answer
(-a^2+5a-8)-(-4a^2+6a-5)
asked Jul 5, 2013 in Algebra 1 Answers by brad | 697 views
1 answer
find the product [6a+5] [4a-1]
asked Jun 5, 2013 in Algebra 2 Answers by anonymous | 520 views
1 answer
8m+4a=168 and 4m-6a=132 by substitution and elimination
asked Apr 21, 2013 in Algebra 1 Answers by anonymous | 609 views
1 answer
4a+3b=12 , 6a-5b=2 gauss method
asked Apr 5, 2013 in Calculus Answers by anonymous | 729 views
1 answer
find the perimeter of 4a + 8 + 6a + 5
asked Apr 3, 2013 in Algebra 2 Answers by anonymous | 639 views
1 answer
2a(5a-2) + 3a(2a+6) + 8 =a(4a+1) + 2a(6a-4) + 50
asked Jan 31, 2013 in Algebra 1 Answers by anonymous | 1.6k views
1 answer
6a+4b+8+3b-4a+9
asked Aug 12, 2012 in Algebra 1 Answers by anonymous | 1.6k views
0 answers
2a^3-6a^2+4a-5
asked Jul 22, 2012 in Calculus Answers by anonymous | 884 views
1 answer
how do you fin the unit price for $57.50 for 5 dvd's
asked Oct 17, 2012 in Pre-Algebra Answers by apriladamson Level 1 User (140 points) | 635 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
733,017 users