avountae2003
  • avountae2003
I have these on my study guide but for some reason I keep getting them wrong can someone break it down for me. 1. 2+4(x-7)=7-5(x-4) 2. 2(5z-1)-2(z+9)=3(z+1) This one is a fraction: -5/9x+2/3=5/9
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
can you show how you did these?
avountae2003
  • avountae2003
1. 2+4x-28=7-5x+20 4x-26=27+5x +26 4x=53+5x -5x 9x=53 /9 53/9=x
avountae2003
  • avountae2003
2. 10z-2-2z-18=3z+3 8z-20=3z+3 +20 8z=3z+23 -3 5z=23 /5 23/5=z

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avountae2003
  • avountae2003
Thats all I know because the fraction one I dont understand at all.
anonymous
  • anonymous
ok. give me a sec
avountae2003
  • avountae2003
ok
mathstudent55
  • mathstudent55
1. 2+4x-28=7-5x+20 4x-26=27+5x ^ | how did this become +? It was - in the line abnove.
mathstudent55
  • mathstudent55
^above
avountae2003
  • avountae2003
oh I accidentally changed it
mathstudent55
  • mathstudent55
Interestingly, later you made another mistake, and the answer came out correct.
anonymous
  • anonymous
I ended up with the same thing you did for both.
mathstudent55
  • mathstudent55
1. 2 + 4x - 28 = 7 - 5x + 20 4x - 26 = 27 - 5x +5x +5x ------------------ 9x - 26 = 27 + 26 +26 -------------- 9x = 53 x = 53/9
avountae2003
  • avountae2003
When I put them in my study it guide it say I have done it wrong.
mathstudent55
  • mathstudent55
Your final answer to problem 1 is correct, but you made two mistakes which somehow canceled each other.
avountae2003
  • avountae2003
okay could you show me what I did wrong
mathstudent55
  • mathstudent55
Problem 2. 2(5z-1)-2(z+9)=3(z+1) 10z-2-2z-18=3z+3 <---- correct 8z-20=3z+3 <----- correct +20 --------------- 8z=3z+23 <------- correct -3 <----- should read -3z 5z=23 /5 23/5=z <----- correct final answer
mathstudent55
  • mathstudent55
You did problem 2 well.
avountae2003
  • avountae2003
Thank you but for some reason it is wrong
anonymous
  • anonymous
For the third one is it like this with the x beside -5/9? just want to make sure it's not in the denominator \[-\frac{ 5 }{ 9 }x+\frac{ 2 }{ 3 }=\frac{ 5 }{ 9}\]
mathstudent55
  • mathstudent55
The answer is correct. Do they ask for a decimal instead of a fraction?
avountae2003
  • avountae2003
Yes peachpi and it ask for a integer or simplified fraction
anonymous
  • anonymous
ok. you can do the same thing you did for the others. Start by subtracting 2/3 from both sides, then you'll need to get a common denominator to subtract the fractions. |dw:1439177420232:dw|
avountae2003
  • avountae2003
ok do I find the common denominator on both fractions or just change one?
anonymous
  • anonymous
you only have to change the 2/3 to ninths
avountae2003
  • avountae2003
ok now I see thank you. The first two problem though are still wrong
anonymous
  • anonymous
I don't know what they're looking for. Your work is correct other than the sign errors on the first problem.
avountae2003
  • avountae2003
okay thank you for the help

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