jagr2713
  • jagr2713
3x+6y=12 -9x+y=21
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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jagr2713
  • jagr2713
@Nnesha
anonymous
  • anonymous
you have to make the variable match in both equations. The easiest way to do that would be multiply the first equation by 3
pooja195
  • pooja195
What do you need to do?

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More answers

jagr2713
  • jagr2713
don't we change the first equation into y-mx+b
pooja195
  • pooja195
−9x+y+9x=21+9x(Add 9x to both sides) y=9x+21
Nnesha
  • Nnesha
it depends on the statement substitution , elimination/addition , or graphing ?
pooja195
  • pooja195
^thats what i meant to ask.
jagr2713
  • jagr2713
substitution
pooja195
  • pooja195
aight so continue with this −9x+y+9x=21+9x(Add 9x to both sides) y=9x+21
pooja195
  • pooja195
Now that you know what y equals plug it into equation 1 3x+6(9x+21)=12 solve for x
jagr2713
  • jagr2713
oh I did it the other way lol
Nnesha
  • Nnesha
\(\color{blue}{\text{Originally Posted by}}\) @jagr2713 don't we change the first equation into y-mx+b \(\color{blue}{\text{End of Quote}}\) not necessarily, you don't have to write in slope intercept you can solve for x too.
pooja195
  • pooja195
ok well what did u get for x?
jagr2713
  • jagr2713
um -2 so now we plug it into y=9(-2)+21 y=3
pooja195
  • pooja195
Correct

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