how to solve 2x+2y=2 , -4x+4y=12

this is  solving equations using substitution .... i have ALOT more but i juss dnt get this stuff
in Pre-Algebra 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

how to solve 2x+2y=2 , -4x+4y=12
this is  solving equations using substitution .... i have ALOT more but i juss dnt get this stuff

2x + 2y = 2      -4x + 4y = 12
x + y = 1
x = 1 - y

 -4x + 4y = 12
 -4(1 - y) + 4y = 12
(-4 + 4y) + 4y = 12
-4 + 8y = 12
8y = 16
y = 2

2x + 2y = 2
2x + 2(2) = 2
2x + 4 = 2
2x = -2
x = -1

Check.

-4x + 4y = 12
-4(-1) + 4(2) = 12
4 + 8 = 12

Answer: x = -1 and y = 2

 

by Level 11 User (78.4k points)

Related questions

1 answer
solve 1/2x-2y=6; 4x+2y=12
asked Jul 26, 2013 in Algebra 2 Answers by Jennifer A. Cascaño Level 12 User (101k points) | 617 views
1 answer
3x + 2y = 7 and x - 4y = -21
asked Dec 18, 2012 in Geometry Answers by anonymous | 2.2k views
3 answers
4y+3(2y+4)=11
asked Feb 20, 2012 in Algebra 1 Answers by anonymous | 931 views
1 answer
2x+2y=-4 4x-2y=8
asked Feb 8, 2012 in Algebra 1 Answers by anonymous | 925 views
1 answer
solve 4x-2y=-2 and 4x+5y=33
asked May 22, 2013 in Algebra 1 Answers by anonymous | 850 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. complete the following. 825 use each digit once .make the two smallest 3 digit numbers and two largest 3-digit number (2)
  4. Solve 15 -1(12÷4+1)? (4)
  5. 8:4(5+2) (3)

Most popular tags

87,544 questions
99,732 answers
2,417 comments
482,918 users