anonymous
  • anonymous
I need help
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
anonymous
  • anonymous
I think its c but I'm not sure
anonymous
  • anonymous
@abdul_shabeer

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More answers

iGreen
  • iGreen
Plug in x + 3 for 'y' in the first equation
iGreen
  • iGreen
\(\sf -x - (x + 3) = 1\) Solve for 'x'..can you do that?
anonymous
  • anonymous
-1, 2?
iGreen
  • iGreen
No, don't guess.. do you know what -x - x is?
iGreen
  • iGreen
It's the same as -1 - 1, but you put an 'x' next to it..so what's -1 - 1?
anonymous
  • anonymous
im not sure
iGreen
  • iGreen
You don't know what -1 - 1 is?
anonymous
  • anonymous
-2
iGreen
  • iGreen
Yes..so -x - x = -2x
iGreen
  • iGreen
So we have: \(\sf -2x - 3 = 1\) Add 3 to both sides
anonymous
  • anonymous
1 - 3 +4 ?
iGreen
  • iGreen
???
anonymous
  • anonymous
added 3 to both sides
iGreen
  • iGreen
\(\sf -2x - 3 + 3 = 1 + 3\) \(\sf -2x \cancel{- 3 + 3} = 1 + 3\)
iGreen
  • iGreen
Which gives us: \(\sf -2x = 1 + 3\)
anonymous
  • anonymous
okay
iGreen
  • iGreen
1 + 3 = ?
anonymous
  • anonymous
4
iGreen
  • iGreen
Yes, so we have: \(\sf -2x = 4\) Divide -2 to both sides.
anonymous
  • anonymous
-0.5
anonymous
  • anonymous
1 = -0.5
iGreen
  • iGreen
No.. \(\sf \dfrac{-2x}{-2} = \dfrac{4}{-2}\) \(\sf \dfrac{\cancel{-2}x}{\cancel{-2}} = \dfrac{4}{-2}\) \(\sf x = \dfrac{4}{-2}\) Divide
anonymous
  • anonymous
i got -2
anonymous
  • anonymous
x = -2
iGreen
  • iGreen
Yeah, that's our x-value..now which option has an x-value of -2?
anonymous
  • anonymous
B and d
iGreen
  • iGreen
No..
iGreen
  • iGreen
Only one of them do..
anonymous
  • anonymous
oh, my mistake. its b
iGreen
  • iGreen
Yep, that's our answer.

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