anonymous
  • anonymous
I have 7z - 3x = 18 2z = 1 + 5x And now I dk what to do
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
ok thanks so much
anonymous
  • anonymous
x=1 and z=3
anonymous
  • anonymous
The is a literal equation with substitution I flipped the 2z = 1 + 5x It was originally 2z - 5x = 1

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More answers

anonymous
  • anonymous
it doesnt matter:)
amistre64
  • amistre64
divide by 2 to get z alone
anonymous
  • anonymous
I divide what by two?
amistre64
  • amistre64
2z = 1 + 5x -----------; z = (1/2) +(5/2)x 2
anonymous
  • anonymous
What about the first equation?
amistre64
  • amistre64
what about it?
anonymous
  • anonymous
What happens to it
amistre64
  • amistre64
you sub the z value into it and solve for x
amistre64
  • amistre64
7z - 3x = 18 7((1/2)+(5/2)x) - 3x = 18
anonymous
  • anonymous
Then what do I do?
amistre64
  • amistre64
7((1/2)+(5/2)x) - 3x = 18 (2) 7(1+5x) - 6x = 36
amistre64
  • amistre64
7+35x -6x = 36 x = 1
anonymous
  • anonymous
Ugh. Now I should have known that!
amistre64
  • amistre64
i goofed that answer but you see it lol
anonymous
  • anonymous
What about the 7?
anonymous
  • anonymous
Doesn't it get multiplied by 2 also?
amistre64
  • amistre64
7+35x -6x = 36 29x = 29 ..... x=1; lol thats a coincidents
amistre64
  • amistre64
lets focus on that part and see what I did ok?
amistre64
  • amistre64
1+5x 7( ----- ) times 2 = 7(1+5x) 2
anonymous
  • anonymous
How do I find the Y again?
anonymous
  • anonymous
Because I am confused about that bit right know?
amistre64
  • amistre64
the y or the z?
anonymous
  • anonymous
Sorry, Z
amistre64
  • amistre64
ok... do you see why when we mulitply by 2 we get 7(1+5x) tho?
anonymous
  • anonymous
Yes
amistre64
  • amistre64
then lets solve for x: 7+35x -6x = 36 ; -7 and add like terms 7-7+35x -6x = 36-7 29x = 29 x = 1 right?
anonymous
  • anonymous
Yes I have the much of the problem solved :D
amistre64
  • amistre64
2z = 1 + 5x 2z = 1+5 2z = 6 z = 3
anonymous
  • anonymous
Finally the problem is finished :D
amistre64
  • amistre64
once you know what x is....use it lol
anonymous
  • anonymous
Thks again!!!!!!!!!!!!!!
amistre64
  • amistre64
yw :)
anonymous
  • anonymous
The problem looks like this 7z - 3x = 18 2z - 5x = 1 changes to 2z = 1 + 5x Then I divide 2z by 2 to get 7z - 3x = 18 z = 1/2 5x/2 which turns to 7(1/2) 5x/2) - 3x = 18 which turns to 7 + 35x -6x = 36 which turns to 7 + 29x = 36 which turns to 29x = 29 then x = 1 then 2z = 1 + 5 (1) 2z = 1 + 5 2z = 6 z = 3 (1,3)

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